The series tells the adventures of a group of youngsters between ages 9 and 17, while on summer vacation in a small coastal town on the Spanish Mediterranean Costa del Sol.
Private detective Germán Areta el Piojo gets a terminally ill client who wishes to see his long lost, runaway daughter before he dies.
After his son dies, an elderly man comes back to Spain from the US and hopes to find out which of his granddaughters is true, and which one is bastard.