The Carrier — Sophie Hannah

The latest in Sophie Hannah's internationally bestselling Zailer & Waterhouse series, named by The Sunday Times as one of the 50 Best Thrillers of the Last Five Years

When Gaby's plane is delayed, she's forced to share a hotel room with a stranger: Lauren, who is terrified of her. But why is she scared of Gaby in particular? Lauren won't explain. Instead, she blurts out something about an innocent man going to prison for murder. Gaby soon suspects that Lauren's presence on her flight isn't a coincidence, because the murder victim is Francine Breary, the wife of the only man Gaby has ever truly loved.

Tim Breary has confessed. He's even provided the police with evidence. The only thing he hasn't given them is a motive. He claims to have no idea why he murdered his wife…