Ruben is a successful salesman. Roz hates her boring admin job. Ruben owns his own home. Roz still lives with her nasty mum and dad. One is a serial killer, the other desperate to learn the trade. When high-school misfits Ruben Jones and Roz Smith's paths cross later in life, they see something in the other no one else has and they team up to form a friendship based on the one thing they have in common – murder.