The mine is an impartial killer & a lethal challenge to any volunteer in the Special Countermeasures of the Royal Navy. They are brave lonely men with something to prove or nothing left to lose. Lieutenant-Commander David Masters haunted by a split second glimpse of the mine that destroyed his first & only command H.M. Submarine Tornado now defuses the beast on land & teaches the same deadly science to others who too often die in the attempt. Lieutenant Chris Foley minelaying off an enemy coast in ML366 rolls on an uneasy sea with a release bracket sheared & a lie mine jammed & hears the menacing growl of approaching E-boats. & Sub-Lieutenant Michael Lincoln hailed as a hero dreads exposure as a coward even more than the unexpected booby-trap or the gentle whirr of the activated fuse marking the last twelve seconds of his life.