Spain, late 19th century. Judge Javier Zarco finds in a cemetery a skull pierced by a nail and suspects that a murder has been committed.

A girl needs her brother to fulfill an odd request, a good trip turns bad, a CEO gets invited to a mysterious party, and it all centers around the iconic red crustacean.

After losing his brother in a car accident, Robbie obsesses over the last conversation they had about a treehouse they wanted to build as kids. Through extreme isolation and a number of obstacles, Robbie attempts to build the treehouse to the exact specifications his brother wanted.

Alba has lost her dog and all the hopes she had to find it...