As a U.S. Senator, Harry Truman led a congressional committee dedicated to ferreting out corruption during World War II with a simple credo: help the country win the war and bring our soldiers home.

In the spring of 1944, Truman receives a series of ominous letters from a lawyer out in Hanford, Washington. His client, a farmer who lost his land when the government confiscated it for a secret project, has been silenced and drafted into the Army.

Truman personally leads this investigation, bringing along former policeman Carl Hancock. Soon after they start looking into things, Truman and Hancock witness a pair of brutally murdered corpses, a town clouded in secrecy, and more than one person who'd prefer to be done with the pesky senator.

But the investigators are tenacious, and in no time, Truman and Hancock not only find themselves embroiled in the top-secret world of the Manhattan Project but also must confront the worst act of treason in American history since Benedict Arnold.