Meet Marvin, a lovable monster with a twelve-stringed baby fang guitar, a rambunctious case of ADHD, emotions that sometimes overwhelm him (and others), and a diary to record it all. While Marvin got it together in Marvin's Monster Diary: ADHD Attacks, his lab partner Lyssa's emotional roller coaster is a bit out of control. Can he help her--and win the Science Scare-Fair--before she explodes?

School's out and summer camp's in! When Marvin and his friends meet Joey, a lake monster with a loud mouth and few manners, it seems that Marvin is the only kid in camp who will be his friend. And Marvin's friendship with the lake monster is causing ripples among his other friends. No one wants to be around the kid who cuts in line, or talks over them, or tells them what he really thinks about their art project. But Joey secretly wants only one thing:...