A night manager of a European hotel is recruited by intelligence agents to infiltrate an international arms dealer's network.

Former British soldier Jonathan Pine (Tom Hiddleston) is recruited by Burr (Olivia Colman), an intelligence operative. He is tasked to navigate Whitehall and Washington, D.C. where there is an alliance between the intelligence community and the secret arms trade. He must infiltrate the inner circle of arms dealer Richard Onslow Roper (Hugh Laurie), Roper's girlfriend Jed (Elizabeth Debicki), and associate Corcoran (Tom Hollander).