Refitted and rushed back into battle, half her crew raw recruits, U-451 is on the prowl again. Captain Baldur Wolz - the grizzled veteran they call Sea Wolf - will need all his commander's skills to keep his ship on her course of slaughter. And he must save his killing machine's deadliest weapons for the biggest targets: American tankers risking the Atlantic crossing to beleaguered Britain. But the pressure begins to rise inside the U-boat's steel shell. Wolz and his crew have been lucky too long - now they're living on borrowed time...