In pre-World War II Sicily, just as the fascists come to power, two men fall in love with the same woman. The changes in their country's politics ultimately take all three on a journey across the ocean to New York City.

Prosecutor Etzel discovers that his father has sentenced a man, Leonardo Maurizius, on mere presumptions. He then makes it a point of honor to trace the sources of the case to uncover the truth.

Four women were murdered, each was knifed and, though they had their clothes torn, they weren't molested. As the famed police inspector Jules Maigret pieces the clues together, he comes to realize that for the elusive man that he suspects to be unmasked, he has to set him a trap.