Catrina(Cat), Maya, and their mom and dad have have moved to Bahia De La Luna, California, because of her sister, Maya. Maya has Cystic Fibrosis which is a hereditary disease that affects your lungs.
While Cat and Maya are exploring the places around their new house, they come across an arcade, where they meet Carlos, which happens to be their new neighbor. He tells them about the town's ghost tour.
After a couple days, Cat agrees to let Carlos take Maya and her to the Ghost tour. Maya accidentally drops her soda and scares the ghosts. They start surrounding her and taking her breath. She becomes out of breath and coughs.
Te amo abuela. Siempre estare contigo (Love you grandma. I will always be with you)
Maya overexerted herself, and had to in the hospital for a month. Cat was very upset with herself. Maya has to wear a breathing tube for a while after. Cat went to school afterward, and made a couple friends.
During Halloween, Cat and her friend met Carlos and his uncle who is 8 years old. His uncle helped Cat get over her hatred for ghosts, and she even took him home to meet Maya.
Cat becomes comfortable near ghosts now. In the festival, she was hoping to see her grandma's spirit. Even though that didn't happen, she had a blast making memories with her new city.