Triple Jeopardy; Three Novels

Triple Jeopardy includes three novels by a master of detective fiction, and two of them feature the admirable Colonel Anthony Gethryn.
Warrant For X: considered by Alexander Woollcott “the best detective story in any language.”
Escape: “a memorable adventure in breathlessness.”
The Polferry Riddle: a clever twist to the classic “locked room” mystery.This reprint edition is from 1962, the novels were written in in 1931, 1 932, 1938.
  Philip MacDonald is also the author of The List of Adrian Messenger