Jaunty, unlifelike British agent Alfred Baldwin tries to prevent the decimation of Boston by Libyan terrorists--in an implausible, pint-sized imitation of Collins & Lapierre's The Fifth Horseman. ""Blue Flame,"" you see, is the code name for the revenge-plot of terrorist Jordan Satori: he plans to hijack a Liquefied Natural Gas supertanker headed for the US, attach mines to the hull, then blow it all up in Boston harbor. And the only man in the world who knows what Satori is up to is MI-5 agent Baldwin, who scurries around the world trying to convince the UK and the US about the danger. No one believes him, however, so Baldwin decides to Go It Alone: he heads for Boston, determined to track down Satori's accomplices (he gets shot). . . while his only ally--the beautiful wife of the tanker-line tycoon--is aboard the LNG ship, perilously sleuthing on her own. And it's only when Satori and his crony bloodily take over the tanker--they've been disguised as crew--that Baldwin starts getting some CIA assistance in foiling the harbor holocaust. (At the big showdown moment, the tycoon's wife, held hostage, hides the mine detonator between her thighs.) Standard techno-terrorism stuff--undermined rather than enhanced by Gilmore's fumbling attempts to make Baldwin a breezy, chatty sort of hero.