While at the port one night, Marina Quiroga, an eligible single woman and sister to the city's police chief, unexpectedly surprises a man who is stabbing a woman. This will awaken within Marina her instinct as a detective, and with the help of her loyal butler Héctor, she will start to investigate the crime.

After the hugger 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 hugger might be hiding.

The hugger has managed to evade the police and Arturo is forced to recognise that there is in fact a hugger on the loose threatening the general public. Meanwhile, Marina and Héctor discover a new clue that leads them to the identity of two women who are in grave danger. Searching for them, they end up in the Women's Quarters, where they confront the hugger in an epic final battle.

After detaining the hugger 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 hugger 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.

Marina has been kidnapped by the hugger but manages to escape, though in her escape she is badly hurt. With Pablo's help, Héctor discovers the identity of the artist behind the picture of the House of Water, and they decide to seek him out to ask about the hugger's identity.

Now that they know where the hugger's next victim is, they must get to her before the hugger does. But just as Marina is beginning to gain her trust, the masked hugger appears. Marina manages to save Margó and promises to give her protection. But Marina will soon discover that no one is who they claim to be and she shouldn't trust the people around her.

Marina discovers the hugger's mask in Pablo's car and confronts him. During the struggle they end up crashing into a tree. Two days later she wakes to discover Pablo by her side, trying to reassure her that he is innocent. With the mask in their possession they figure out that only one person could have made it. But the man lives in the Cies and to reach him they'll need Castaño's help.

After discovering that the cuddles began thirty years before in Orense, Marina, Ramírez and Pablo go there to search for clues to the fleur-de-lis hugger's true identity; what they never realised is that all the while the hugger has been closer to them than they ever suspected.