"On May 1, 1915, a luxury ocean liner as richly appointed as an English country house sailed out of New York, bound for Liverpool, carrying a record number of children and infants. The passengers were anxious. ...[but] captain William Thomas Turner placed tremendous faith in the gentlemanly strictures of warfare that for a century had kept civilian ships safe from attack. He knew, moreover, that his ship-- the fastest then in service-- could outrun any threat. Germany, however, was determined to change the rules of the game... Meanwhile, an ultra-secret British intelligence unit tracked [a] U-boat, but told no one. As U-20 and the Lusitania made their way toward Liverpool, an array of forces, both grand and achingly small-- hubris, a chance fog, a closely guarded secret, and more-- all converged to produce one of the great disasters of history."