Someone doesn't want President Owen Masters to celebrate his next birthday. While investigating three apparently unrelated homicides, police detective, Danny Morgan and FBI agent, Steve Prosky, begin to suspect a possible assassination plot. Vacationing political science teacher, Sue Findley, is thrust into the middle of the intrigue when she finds herself staring down the barrel of the revolver that has just killed her cab driver. By fleeing from the scene, she becomes not only a suspect, but an important witness shadowed by the police, FBI and Secret Service. In three days, in an open park, President Masters is scheduled to dedicate a memorial. The usual precautions will be taken for his safety. But is it enough to foil a hit man who has designed an undetectable, foolproof device?