Best friends Debbie and Judith are forced on the run when Debbie discovers Judith isn't a forensic accountant, she's an international assassin! With a mysterious figure chasing them, and Debbie's husband involved in something deeply corrupt, it's a race against time and a road trip across Europe to untangle the truth and stay alive.
Back in London, Judith and Debbie's friendship seems beyond repair. Queenie learns a shocking truth, Sam deals with the fallout of his actions, and the Director takes Judith back into the fold. As the final piece of Ana's plan falls into place, Debbie and Judith hurtle towards a spectacular season finale.
Judith and Debbie make it to Spain, reeling from their discovery about David. The Director gives Judith an impossible choice. Interpol detective Jacques Boucher investigates a body on the train. Debbie and Judith work together to find Billy Donovan, and Debbie gets her groove back. Sam and Queenie make a dangerous decision. The Albanians close in.
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