German military intelligence officer Gregor Reinhardt is back, this time in response to the suspected suicide of a Private under his command. Private Willy Sattler, an explosives expert, was accused of bombing and killing three German officers. All evidence points both to Private Sattler's guilt and to suicide, but Reinhardt has suspicions. At great personal risk, Reinhardt sets out to solve the mystery of who killed the three German officers, as well as who killed Private Willy Sattler.