When two colleagues of James Bond are murdered, James follows the widow of a double agent who has been killed, and a confrontation ensues. The double agent is part of S.P.E.C.T.R.E., and the organization's meeting in a secret lair in Paris regrets the agent's death as it deals with new criminal business. Emilio Largo, a ruthless and flamboyant one-eyed enforcer, has hatched a scheme against the North Atlantic Treaty powers that begins at a rehabilitation clinic near a Royal Air Force airbase. Scheduled to pilot an R.A.F. Vulcan strategic bomber on a normal "fail-safe" flight is Francois Derval, who is having a passionate affair with the magnificently endowed beauty Fiona Volpe, an affair that S.P.E.C.T.R.E. exploits. Soon, the Vulcan and its warload of two nuclear bombs has been hijacked, the bombs seized by Largo, for use in S.P.E.C.T.R.E.'s most audacious extortion scheme yet. James Bond, however, finds a key clue in the sister of Francois Derval, Dominique "Domino" Derval, a beautiful young woman who is a passionate scuba diver living in Nassau, The Bahamas. When James investigates Domino, he comes into contact with a S.P.E.C.T.R.E. operation on the island, and he gets help from H.M.S.S.' man in Nassau, Pinder, and an old C.I.A. chum, Felix Leiter. But when James and Felix find out what S.P.E.C.T.R.E. is up to, it may be too late to save a major U.S. coastal city from nuclear annihilation.