ONE WAS A KILLER: A TOUGH KID—with a record of violence. The headlines screamed for a fast conviction. THE LEADER of a vicious gang. What had he wanted from Ann Avery the night of her death? A DOPE ADDICT—She looked too frail to kill anyone. A HIGH LIVER—on a teacher's salary. Where did he get the big money? A JEALOUS HUSBAND—Did he really love his wife? A LUSH—Blackmail was her only chance for more whiskey. A RELUCTANT WITNESS—Why did he hide a piece of explosive evidence which might clear another suspect?

These were the people psychoanalyst Gray set out to question about the murder of Ann Avery, knowing as he searched that one or more among them would also be killed!