Not one, but two dead bodies are discovered on a French golf course, leaving Hercule Poirot to unravel a grisly conundrum.

Hercule Poirot receives an urgent cry for help from a client summoning him to France. But he is too late, and arrives to find his client facedown in a shallow grave on a golf course, brutally stabbed to death, and dressed in a too-large overcoat with an impassioned love letter in the pocket.

With a long line of suspects including the victim's wife, his embittered son, and his mistress, Poirot works to unravel the mystery.

But before Poirot can discover the meaning of the clues, a second, identically murdered corpse is found ...