An old friend is posting about how well his investments are doing - and he's offering you the chance to get involved too. Would you know what to do?

In this final episode of the series, the Scam Secrets team unpick a fraud which ripped through a group of close mates. One by one, their Instagram accounts were infiltrated as, believing they were chatting to a friend, they handed over their login details, hoping to join a crypto investment scheme. But that gave the criminals all they needed to take over the account and use it as a platform to try the same trick on all their followers.

It's a modern day pyramid scheme that plays on the victims' desire to make money and their trust in their friends.

Scam Secrets will be back later in the year. In the meantime, you can contact the team at [email protected].

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

A roofer's at your door - they've spotted a couple of loose tiles and they can fix them straight away. It's only a quick job. Would you know what to do?

Almost all of the scams we've dissected so far have been done remotely - on the phone, by text or online. But what if the criminal is standing right in front of you - perhaps even inside your home? That's what the Scam Secrets team are looking at in this episode. Because while criminals have embraced the digital world and AI, they'll still steal from you face to face too - and many of the techniques are the same.

We hear from Jane, who got one of those knocks on the door from a 'roofer' - before long, she'd had thousands of pounds stolen by criminals who even used a fake video of birds on her roof to try to steal more.

It's not just rogue traders though - who can resist helping someone in need? We'll hear what happens when a man approaches people at a motorway service station with a simple-sounding request for help...

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

A group of young jobseekers are gathered outside a dental surgery in West London, nervously waiting for a trial shift for the job they've just applied for. But as time ticks on, they realise there is no shift. In fact there is no job. But it gets much worse - their identities have all been stolen.

Shari Vahl and the Scam Secrets team hear from one of those people, Joe. For him, the real impact of what the criminals had done only hit home several months later.

What started as a plausible looking job posting on a big recruitment site, from a business that checked out, ended with him trying to extract himself from thousands of pounds' worth of loans and the lingering fear of what the criminals would do next.

It's a growing scam aimed at anyone browsing online recruitment sites. Would you spot the red flags?

Remember you can get in touch with the Scam Secrets team: [email protected]

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

If you buy from a website that turns out to be fake and run by criminals, your first thought is probably about the money you've parted with. But that's not all they're after. Because you're also handing over personal data that can be far more lucrative than whatever you paid for the rubbish clothes that you're left with.

In this episode, Shari Vahl, Dr Lis Carter and Alex Wood revisit the Great Knitted Cardigan Scam to find out what happens to the information victims enter into these sites. Email address, phone number, bank details...Shari calls it identity bingo. She's uncovered an audacious technique where victims' details are used as returns addresses to make these bogus sites look legitimate. And it doesn't stop there - cyber security expert Matthew Gracey-McMinn reveals how our data changes hands on the dark web and some of the other uses criminals make of it.

Remember you can contact the Scam Secrets team and tell us the scams you want to see investigated - [email protected]

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

You've been invited onto a well-known podcast (not this one). They'll even pay you to take part. Would you know what to do?

Shari Vahl, Alex Wood and Dr Lis Carter unravel an elaborate scam that's aimed at people and organisations with a big social following. They hear from a dog groomer who was tricked into handing over her Facebook account by an extremely convincing-sounding invitation to appear on a US podcast. The same trick has been used on other charities and influencers and it's made even harder to spot because the podcast does exist. So how are you supposed to check?

And crucially, what are the criminals really after?

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

You've booked a holiday and the hotel gets in touch to ask for a payment to confirm your booking. They know your name and they've got all the details of your reservation. Would you know what to do? In this episode, people using booking.com are targeted by a hard-to-spot scam where official-looking messages arrive, asking for payment. Needless to say, that payment doesn't go to the hotel. But how do the criminals do it? And what chance do you have of spotting it?

Shari Vahl, Dr Lis Carter and Alex Wood find out, with the help of cyber crime expert Rafe Pilling.

Remember you can contact the programme at [email protected].

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

Whether we're chatting, texting, buying or dating, the tech services we all use are being abused by criminals to worm their way into our lives. So what are these huge businesses doing to keep us safe?

In this episode of Scam Secrets recorded at the United Nations Global Fraud Summit in Vienna, some of the biggest names in consumer tech chat to Shari Vahl, Dr Lis Carter and Alex Wood about the threats they're facing.

Red flags at the ready, we ask Amazon what the world's biggest online marketplace is doing to protect users. Match Group, owner of Tinder, Hinge and a host of other well-known dating sites tells us it's trying to weed out fake profiles. And Virgin Media/O2 lifts the lid on how those Winter Fuel Allowance texts arrive on your phone.

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

A message pops up. It's a scam, you can spot that. But who sent it? Where in the world did it come from? And how has it ended up in your inbox? For this special episode of Scam Secrets, the team visit the United Nations Global Fraud Summit in Vienna. Pretty much everyone engaged in the world fight against scams is there too, from politicians and police to the biggest tech companies on the planet. Challenged by listener Catherine to find out more about the criminals who stole £200,000 from her dad in the previous episode, Shari Vahl, Dr Lis Carter and Alex Wood ask Interpol why it isn't easier to track criminals down. And the organised crime chief of the United Nations tells us how networks of global organised crime lie behind that message you received - and offers harrowing evidence of why the scammers are often victims too.

PRESENTER: SHARI VAHL

Scam Secrets is back with a close look at a disturbing and emerging scam technique that can totally clean out its victims.

In a hybrid scam - or pig butchering, as the criminals describe it - the manipulation reaches new levels as investment and romance scams are combined. Shari Vahl, criminal language expert Dr Lis Carter and former fraudster Alex Wood hear from Catherine, whose father was targeted in this way. A chilling voicenote reveals the romantic element to the scam, while a criminal pretending to be an investment adviser was busy stealing more than £200,000 from the 84-year-old.

One of the leading experts on this trend, Dr Martina Dove, tells the team how she's read detailed scripts guiding criminals through how to psychologically manipulate different types of victims to a terrifying level of detail.

Remember if there's a scam you want the team to investigate, or if you want to let us know what you thought of the programme - get in touch at [email protected]

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY

It's coming up to Christmas, and you might have gift cards on your mind. The perfect present choice for many scenarios - but also the perfect weapon for criminals.

So what turns these versatile gifts into gold dust for criminals? That's what Shari Vahl, Elisabeth Carter and Alex Wood will be finding out, along with the shocking story of Sarah, who thought she was helping out her boss while on work experience but ended up buying £1,300 in gift cards for criminals.

As always, the team will get under the skin of the scam, hearing how criminals target their victims and why even a simple LinkedIn post could put you at risk.

PRESENTER: SHARI VAHL

PRODUCER: TOM MOSELEY