"Holly's story starts with a cloud - and it's not a fluffy, white one you'd see on a sunny day. Instead, it's a scary, dark cloud that looms over her and makes anxiety-provoking demands, which, if disobeyed, could cause bad things to happen to her loved ones. but fortunately for Holly, she is seeing a therapist who has a plan to help her get rid of this bullying cloud, once and for all. You may have guessed that Holly's cloud is a manifestation of obsessive compulsive disorder (OCD), and her therapist aims to treat it with Exposure and Response Prevention Therapy (ERP). ... [This book] introduces both concepts in a kid-friendly manner"--Page 4 of cover.