For fifteen-year-old Mariana Ruiz, it's not so much an unexpected vacation as a literal "guilt trip"—her father's way of atoning for ignoring his Puerto Rican roots. But freedom from her parents is little compensation for being forced to spend two months with complete strangers rather than with her best friends in Philadelphia. 
Once on "vacation," her worst fears come true. The heat is merciless, the food is spicy, and her great aunt and uncle's mountain house teems with relatives, only one of whom—her distant cousin Lilly—speaks English. Bored, and hoping to make up for missing her best friend's star-studded Sweet 16, Mariana offers to help in the planning of Lilly's Quinceañera. Soon, despite herself, Mariana clicks with new friends who open doors to romance and long-hidden secrets. Suddenly the summer she dreaded is ending way too quickly. It might turn out that the last place she ever wanted to go is the one place she truly finds herself.