Ben Lewis's propulsive thriller starring Siena Kelly, Jack Rowan and Iain de Caestecker.

When Jake signs up to a personal training programme that promises to turn the meekest man-boy into an alpha male, he doesn’t have a clue what he’s getting himself into. Two years later, his sister Maya sets out to uncover the truth.

Alex … Iain de Caestecker

Original music and sound design by Danny Krass

With thanks to Dr Joel Busher at the Centre for Trust, Peace and Social Relations, University of Coventry.

A BBC Scotland Production directed by Kirsty Williams