Description from Google Books:

Catrina and her family have moved to the coast of Northern California for the sake of her little sister, Maya, who has cystic fibrosis--and Cat is even less happy about the move when she is told that her new town is inhabited by ghosts, and Maya sets her heart on meeting one.

Snippet from Google Books:

Catrina and her family have moved to the coast of Northern California for the sake of her little sister Maya, who has cystic fibrosis--and Cat is even less happy about the move when she's told that her new town is inhabited by ghosts, and ...

Description from Harvard Library:

Catrina and her family are moving to the coast of Northern California because her little sister, Maya, is sick. Cat isn't happy about leaving her friends for Bahía de la Luna, but Maya has cystic fibrosis and will benefit from the cool, salty air that blows in from the sea. As the girls explore their new home, a neighbor lets them in on a secret: there are ghosts in Bahía de la Luna. Maya is determined to meet one, but Cat wants nothing to do with them. As the time of year when ghosts reunite with their loved ones approaches, Cat must figure out how to put aside her fears for her sister's sake -- and her own.