When his dad winds up in hospital following a rather mysterious accident, book-smart Barnaby (Jack Whitehall) takes it upon himself to save the family's cash-strapped antiques business. What could possibly go wrong? Well, a dodgy deal masterminded by his father leaves Barnaby £50,000 down and lumbered with a looted treasure. He's determined to reclaim his cash, but to do so, he needs help. Big time. Enter Nina Morales (Rosie Perez), a tough New Yorker who Barnaby's sister met while travelling. She and Barnaby couldn't be more different. She's a gun-toting, Brooklyn bounty hunter, while he drives a smart car and lives in Wimbledon. She's wanted by a Mexican cartel while he's doing a PhD in Flemish textiles. They team up on a mission to get his money back. But Barnaby's quiet life soon spirals further out of control, when they're forced into the paths of the police, terrorists and a dangerous Mexican drug cartel.