Tween optimist Marcy Wu lives to make the world a better place, fix what has gone wrong, and spread joy. Meanwhile, cantankerous ghost Spooky lives to make the world a worse place, break what has gone right, and spread misery. When a curse from Spooky backfires, he finds himself forever bound to Marcy Wu. Despite that, Spooky and Marcy Wu form an unlikely friendship that guides each of them through the ups and downs of their respective worlds.