Stage manager Hattie Cocker is looking around the West End theatre where she's about to start her new temporary gig, when she stumbles across the dead body of the current musical's composer.

A week later the prime suspect in the murder is on Hattie's doorstep asking for her help in proving his innocence, and to do that she needs to find a missing musical score. And that may be found in the grand country home of producer Sir Trevor Dougray, where Hattie is stage managing a two-week workshop for his new show.

As deception is layered on deception, Hattie will have to work out who she really knows, and can trust...