We've spent so long asking our guests who they'd like to see in the Trapped History Hall of Fame, that for our 30th episode we thought we'd do something a bit different.

And so Carla, MK and Oswin have each brought along someone they'd like to see honoured. Tune in for a whistle-stop tour through the lives of a First World War heroine, a couple who fought for freedom in South Africa and a union leader who was a conscientious objector.

Three different stories, four hidden and forgotten people, but we hope you will agree, they led some of the fullest and most compelling lives you will hear of.

We want to hear your own nominations for the Hall of Fame, so be inspired and head over to trappedhistory.com to send us your own nominees.

Roll up, roll up for the Season Four closer — as we take a trip to the circus!

At Trapped History, we look at lives and stories which have been forgotten or ignored, and there is one community in Britain which is still shrouded in mystery even in the 21st century: that of the circus people. So who better to lift the curtain than the King of the Ring himself, Zippo the Clown — or just plain Martin Burton to us.

Not only does Martin shine a light on the lure of the circus but he also joins us on a journey back in time, when America was in thrall to the greatest showman of all — Frank Bostock, the Animal King from Darlington. Frank's is an astonishing story and an amazing life, which tells us so much about the glory years at the turn of the 20th century when technology, travel and theatre collided to create the magical potion of 'Spectacle'.

Join Oswin and Carla for this moving Hall of Fame from historian Clare Mulley as she remembers wartime nurses, Dorothy Field and Mollie Evershed. They are the only women among over 22,000 men to be remembered on the Normandy Memorial in Bayeux.

It is a story of courage and selflessness. Prepare to have your heart broken.

She is one of the most important women of the Second World War — a fighter, a secret agent, a government envoy and a commando. But have we heard of her? Can we sing her name? If not, you've come to the right place.

Tune in to hear the astounding story of Elżbieta Zawacka, AKA Agent Zo. It's a tale which takes us from Warsaw and Berlin to Paris and London, a tale of hope and fear, of courage and terror. Above all else, it is the tale of a young woman who won't take no for an answer when the call comes.

Oswin and Carla are joined today by the historian Clare Mulley, whose excellent new book tells the legend that is Zo. It is a wonderful story and a wonderful life. We're honoured to be able to help tell it.

Tune in to a fascinating Hall of Fame as Professor Chris French nominates Ellizabeth Loftus, a psychologist famed for her work on false, recovered and repressed memory.

It's not just Elizabeth's life story here — Chris fills us in on the theory of false memory (remember getting lost in a supermarket?) and the controversies around recovered and repressed childhood memories which she researched and challenged.

It makes for a powerful nomination and we believe this longer format justifies Elizabeth's inclusion in the Hall of Fame.

We might have heard of Amelia Earhart or even Amy Johnson, but who remembers Richarda Morrow-Tait, the first woman to fly around the world?

Well, someone does because on 19th August this year, a blue plaque was unveiled at Cambridge Airport to mark the 75th anniversary of her truly momentous achievement.

We featured Dikki in our first ever season and we couldn't pass up the chance to celebrate her once more. So Oswin travelled to Cambridge to see the blue plaque, catch up with old friends and meet some of Dikki's family to try to find out more about the woman behind the record.

This all-new ‘director’s cut’ of our original episode tells Dikki's story alongside the incomparable Polly Vacher, herself a record-breaker. But we've also got new interviews with Polly as well as with Amanda Harrison, another female pilot inspired by her forebears, and we get to hear from Dikki's relatives about what drove her.

It’s a fascinating story so please join us for this wonderful repeat.

Welcome back after our mid-season break! And what a return – with (drum roll) the mysteries, magic and mayhem of The Amazing Randi. He had everything a conjuror should have – the baffling genius, the cape, the beard, the mortal enemies – but more than anything, he had a mission: to uncover and expose cheats and frauds.

Join Carla and Oswin as Goldsmith's Professor Chris French takes us on a rollercoaster journey of psychics and charlatans, secrecy and snake-oil salesmen – and above all else, of doubt and belief. Hold onto your hats – there might be a rabbit in it . . .

Every episode, we ask our guest to nominate someone for the Trapped History Hall of Fame. Usually, it's someone we've never heard of but really should have. But sometimes, just sometimes, it's someone we think we know all about.

In the historian Kim Wagner's nominee, prepare to find out something new about someone you thought you knew.

It's October 1961. The Beatles are in Hamburg, JFK in the White House, Yuri Gagarin has just shot into space. And a state-sponsored killing spree is going down on the streets of a capital city. But this isn't Rio, Washington or Johannesburg. This isn't Moscow or Port-au-Prince or Saigon. This is Paris, the City of LIght, and by the month's end, over 200 north Africans will have been murdered by the city police.

Rewind a further 60 years and the same thing is playing out in the hills and forests of the Philippines, as the Moro resistance is being wiped out by the American army in the infamous Bud Dajo massacre.

Does history teach us anything? Looking around the world today, can we say that we have learnt from the past? This is a tough and harrowing episode of Trapped History, but it is an important one too.

So join Oswin and Carla as we try to make sense of atrocity in the company of one of the great historians of our times, Kim Wagner.

Join Oswin and Carla as we go back – way back – to a time before podcasts and instagram, before radio and photographs. Join us as we journey back to the 18th century and meet the people who made monarchy work.

And they're not the people you might expect to meet. At a time when Britain's kings and queens barely spoke the language, please let us introduce you to Mehmet and Mustapha, two Turkish men who ran the life of George I. And what about Abdullah, who brought a caracal from India all the way to the King's Menagerie at the Tower of London? Or Bridget Holmes, Frances Talbot and Grace Tosier – without whom, life would have been just a bit less tolerable for the Stuart and Georgian rulers.

So tune in to Dr Mishka Sinha, co-curator of Kensington Palace's wonderful exhibition 'Untold Lives', as we lift the curtain and peer into the machinery of monarchy.