Two Irish smuggler, father and son, are captured by police in Glasgow; in the struggle, a policeman is shot and dies of the wound --neither he nor anyone else knows which of the two criminals fired the shot. Both men are sentenced to death. Then the son confesses he fired the shot. He is hanged and his father stays in jail. Then someone starts making effort sto kill him, and Thane and Moss of Glasgow C.I.D. are called in. This is said in the blurb to be the first Crime Club book by Knox, then a young Glasgow reporter. However, the same is said of In at the Kill. ( )