Desi, Cata and Irene, together once more, have to prove that Eduardo Roselló killed his sister. But Eduardo has his own plans to blackmail Néstor and pin the murder on him.

Néstor is now the main suspect, so Desi and Cata ask Eduardo for his help to prove it. Irene gets an ultimatum from her boss: either she hands the ladies in or she'll be kicked off the force.

Under the relentless desert sun of Alicante, Desi and Cata come face to face with Néstor and Eduardo in a thrilling final duel in the middle of a wild western town.