C.I.B. Agent Pell used his head, even if he did rely on hunches more than on the computer. In fact, when the game got rough, he found that to use his head, he first had to keep it.... _______ Walt Sheldon was writing for the pulps as early as 1940. Having published over 30 stories for the pulps and being a contemporary mystery magazine author, Sheldon was a natural choice to assume the monicker of Ellery Queen, which he did only one time.