An artist struggles with his latest portrait while working away at a manor house in the countryside. Just when he thinks he is getting inspired, strange things start happening around the grounds.

Arthur's 'old man persona' is just a disguise. He's really a trained hitman, one of the best. He's given a new target however there's a complication in the assassination, there's another hitman after the same target.

Heidi: Queen of the Mountain, partially inspired by Johanna Spyri’s beloved Heidi, reimagines the tale for a new audience.

Sir Arthur Conan Doyle, Harry Houdini and Stratton are tasked with the cases that nobody else can solve. It challenges their sense of what is real and what is not. Houdini is a skeptic, while Doyle believes in the unseen. Their diverse viewpoints make solving crime a challenge and often Stratton is put in the middle. The trio will take on cases that involve vampires, ghosts, monsters and poltergeists…or are they a ruse to conceal murder?

The UK's top crime bods are anonymously invited together for the biggest job of their lives, or so they think. However, a police detective is hard on the case and rallies an armed response unit to take the baddies down.