Max Carson (Tom Troupe), one of Quincy's old war buddies, manages to survive a plane crash--only to die after receiving a blood transfusion from his business partner Charlie Barnes (Joseph Campanella), who was likewise in the crash and suffered more serious injuries. The authorities are convinced that somehow, some way, Charlie has murdered Max. Refusing to believe this, Quincy (Jack Klugman) performs an autopsy and discovers that Max died of arsenic poisoning...but how did he get it? ~ Hal Erickson, Rovi