Ana, a nine year old girl, arrives with her mother to an isolated beach with the intention to rest and to know the sea. There, she discovers that they are under a terrible threat, therefore she is obligated to look for help with her father in order to save her mother.

In a bustling Mexican household, seven-year-old Sol is swept up in a whirlwind of preparations for the birthday party for her father, Tona, led by her mother, aunts, and other relatives. As the day goes on, building to an event both anticipated and dreaded, Sol begins to understand the gravity of the celebration this year and watches as her family does the same.