A seaside murder at night. In Sam's, aka Bicycle Man, peaceful workshop, strange things have been happening since the man with the green liquid came in.

It's been a few days since Sam has changed. He became meaner even in Vania's regards, her young assistant. Sam goes out at night, hunting for prey.

At night, Norma The Redhead, using some disguises, continues to kill because of the effect of the green liquid. Meanwhile, Sam wants to make peace with Vania.

A strange interrogation of a mysterious chief of police to Annett Degrò, a young witness. Vania helps Sam after the oath she made to the master, while the detective visits the lab.

Detective Loria asks for advice from former Judge Connery, but he has to deal with his past and with the "ghost of the girl".

Detective Loria, helped by Judge Connery, uncovers the mystery of the green liquid, the seaside murder, and blocks the latest attempt of Norma to hurt, this time Marcela.