Bøger i The Whatif Monster Chapter Book serien

When Sebastian's dads bring home his newly adopted sister, can the Whatif Monster help him overcome his worry about how his life is about to change?

Jonathan James is so excited for his backyard sleepover with Sebastian and Vin! They're going to have such a fun night! But when Vin suddenly decides he has to go home, can the Whatif Monster help the boys save their fun sleepover night?