1915: A German torpedo sinks the British passenger liner, RMS Lusitania. With almost 1,200 passengers drowned, the attack is one of Germany's most vicious acts against civilians. . . .2000: A postal worker and a customer are found murdered in a rural Montana post office. U.S. Postal Inspectors Gillian Loomis and Max Dombrowski are ordered to investigate the brutal crime. Max isn't thrilled. He'd rather be in a big city than in the boondocks. And this Loomis person . . . well, they say she killed someone by accident. Great. And she doesn't seemed thrilled with him, either. But neither has much choice. It's this or worse. When they start looking for evidence, they work together all right, uncovering the existence of three letters written in 1918 by a man named Sharpless Walker.