An up-to-the-minute new thriller in Peter Tonkin’s Mariner series - Richard Mariner and his daughter are visiting the Maritime Museum at Chatham when they are caught up in an attempted terrorist attack. Three young marine engineers are arrested for the failed attack and confined to the newly commissioned prison ship, Fleet. But as Richard learns more about the case, a disquieting question develops in his mind: how on earth did these skilled men fail in their mission to blow up the Chatham Dockyards - and why?