FOUR BY TORREY THE SUICIDE MURDER-Murder for insurance is common enough, but this was much more than that. There were angles so intriguing and baffling that the detective almost overlooked the particular hazards involved M STANDS FOR MURDER-Playing watch dog in a warehouse is war stuff these days, and war stuff in a warehouse spells danger-both for the detective and for the enemy. GUN TRAP FOR A MONEY-KILLER-Sometimes a money-killer will take a job without pay MURDER BY ACCIDENT-Any brother who acts like Peter must be in trouble. At least the girl is sure of it.