Día de las Carpas is a fantasy-adventure film told from the point of view of Jonathan, a young boy who starts the day just wanting to go to see a giant carp that’s been caught at the pier. But after witnessing an immigration raid, Jonathan and his friends find their undocumented neighbor Esme hiding and decide to help her evade ICE agents to get to the beach where she’ll reunite with her family. However, Jonathan puts his fishing mentor, Big Serg , who has promised to take the boys to the beach, in danger since Serg used to run the streets and doesn’t want to get in trouble with authorities again. They all race towards the pier where Esme hides again, but this time inside the giant carp itself, which magically comes alive and jumps into the ocean. In a final miracle, Esme transforms into a mermaid and meets the rest of her mermaid family who have been wai ting for her. By going on this journey, Jonathan also transforms himself from a hesitant boy into a young man willing to take a stand.