“You know Lenny,” Old Man Stein said, “they say some people have a knack for having adventures, and I think you just might be one of them!” Summer is here, and that means the big house is about to fill up with Lenny's cousins – scared city girl Val, brave older cousin Gregie, smart little Marty, fun-loving Maria, and playful young Juan and his flighty sister Catalina. Every summer Lenny's adventurous spirit and colorful imagination take her cousins on a fun-filled, exciting, and sometimes scary escapade. This summer is no exception. Her plan is to convince her cousins to find “El Coco,” the monster of legend that she believes kidnapped a local boy. Aupa! Hurray! Let the summer begin!