Like his ancestors before him, ten-year-old Eduardo enjoys going into Ecuador's rain forest to collect Brazil nuts with his father, but when the wild tamarins that always accompany them disappear Eduardo is determined to find them.

Twelve-year-old Coco Hidden has grown up in her mother's chocolate shop in Colorado, along with her friend Leo de la Cueva, but recently things have not been going well; the shop is failing, and Leo is hanging out with the other boys, and barely wants to talk to her--but when they both win a culinary contest, the two children and their mothers find themselves on a trip to the Amazon in Ecuador, where Coco hopes to find the rare ceiba tree, and where...