When Jack and Paul received a text from their father inviting them over to play with the new train set he'd bought, they were filled with excitement. It seemed, for once, that Darren Sykes was making an effort to bond with his sons.

But when the boys arrived for their custody visit, what started as a seemingly innocent gesture quickly turned sinister.

Darren led his sons to the attic, where the train set awaited - but once all three were inside, he sealed the hatch, trapping them.

Moments later, flames erupted, rapidly consuming the house and creeping toward the attic where the boys were held captive.

What could have driven Darren Sykes to lure his own children into such a horrifying trap?

And would any of them make it out alive?