The eighth book in the internationally bestselling Zailer and Waterhouse Mystery series will keep readers guessing until the very end.

When her plane is delayed overnight, Gaby Struthers finds herself forced to share a hotel room with a stranger, a terrified young woman named Lauren Cookson. But why is Lauren scared of Gaby in particular? Lauren won't explain.

Instead she blurts out something about an innocent man going to prison for a murder he didn't commit, and Gaby soon suspects that Lauren's presence on...