It's summer on 141st Street, and Isa, Jessie, Oliver, Hyacinth, and Laney can't wait for camping trips, bike rides, and all the fun summer has to offer. Most of all, they're looking forward to Papa's surprise fortieth birthday party, which they've been planning for months. But when Papa must leave town suddenly to help his best friend, trouble in theform of their distant grandparents shows up on their doorstep. Not only must the Vanderbeekers face the disappointment of ruined plans, but they have more than one family secret to solve if they are going to give Papa the special birthday he deserves. Witness the power of family history and family love in this funny, poignant addition to a series the New York Times Book Review hails as "delightful and heartwarming."