Doing chores around a mysterious shop that sells happy feelings, eleven-year-old Darcy discovers they might have to close their doors and comes up with a plan to save the Happy Shop--one that involves selling more than just happy feelings.

"Nora loves spending summers with Lola at her sari-sari store, a treasure trove filled with everything you could need, from hair accessories to toys, creamy yema to sour tamarind candy. And this year, Nora is big enough to help her grandmother. But when a heat wave strikes and no one comes to the store, Nora worries that she won't get to spend the rest of the summer with her lola--until she gets a sweet idea. After all, the mangoes on the tree outside...