Best friends Debbie Claybourne and Judith Burton have their world's turned upside down when Debbie discovers Judith isn't a forensic accountant, she's an international assassin! When a mysterious figure from Judith's past emerges and a hit goes badly wrong, they're forced to go on the run together.

Debbie and Judith's road trip to Europe takes an unexpected turn when they're forced to travel by luxury train, only to discover they've been followed. Sam's one night stand is not what she seems. Queenie agrees to help Sam find a body. The Albanians are given a lead. Debbie makes an impossible discovery.