A brother-in-law of El Gitano is mysteriously murdered and a crescent moon is engraved on his temple. Other victims also appear with the same mark. Curro finds a young woman who is also following in the footsteps of the man from the Media Luna.

The violent death of a great landowner and philanthropist casts doubts on Natalia, his young and beautiful widow. Curro Jiménez accidentally meets the son of the deceased and becomes his friend, starting to investigate.