A gang runner from Jason’s past turns up at Cardiff Police Station with a tall tale about a murder during a “secret military experiment”. When Jason learns his best friend Lewis Jones is involved, he decides to investigate. Testing the limits of her mental health recovery, Amy joins Jason, as a technical advisor to the experiment – run by the Cardiff police and the shadowy NCA. This “locked room”, apparently designed to study how prisoners work together to escape, must contain their murderer.

The prime suspect is a figure from Jason and Amy’s first case together: serial killer Martin Marldon. However, he reveals he brought Jason in to seek his help – the victim was his right-hand man, and now he fears for his life. The killer targets Lewis in an attempt to break Jason, but Amy has set a trap for him…

To be published 4th October 2018

Available to pre-order online and from all good bookshops