After the killer threatens Marina, Arturo places security in his mother's house to protect his sister as well as to stop her from continuing her investigation. But Marina and Héctor manage to escape and end up at Belle Epoque, a theatre where they believe the killer might be hiding.

After detaining the killer it seems that Marina will be forced to give up her dream of becoming a cop, but thanks to Castaño the case is reopened. Together they conclude that the killer is still on the loose and the cops propose a plan to catch him: host a masked party for the clients of the House of Water.