El asesinato del delantero centro (Los Titanes del Fútbol, 4)

Titans F.C. are participating again in the PIFIA (Inter-Regional Children's Football Plan), and this time they're traveling to Cádiz to play against CEIP El Peralito from Alpedrete. Shortly after settling into the sports complex where the match is to be played, the opposing team's center forward disappears. Everything seems to indicate that the player has been murdered because someone has left a terrifying message in his room: "A killer is on the loose." From that moment on, Grillo and his teammates begin a wacky investigation to uncover the truth and find the criminal.