Wally Carter—the unbearable husband of a millionaire—is murdered right during a picnic. The case seems completely ordinary to the experienced inspector Hamingway, because the motive to get rid of Wally was common to many—his wife, her longtime admirer, the stepdaughter, the ward, and even the guest in the house. However, very soon the inspector discovers that none of the suspects had either time or opportunity to use the murder weapon. Almost everyone has an alibi. So which of the guests is lying?