Evil under the Sun (1941)
Blurb:
My review:
Unquestionably one of her three or four best, so absolutely superb. Poirot is in grand form as he investigates the murder by strangling of a beauty at a fashionable beach resort, a murder which may be either the culmination of a romantic triangle or a sequel to two earlier, unsolved murders. Not only is the characterisation extremely good (notably the adolescent stepdaughter of the victim), but the plot is one of those extremely tricky alibi time-juggling puzzles which Christie can do better than anybody else, combined with a neat reversal of the triangle (seen, as always, from the wrong angle).