Velma thinks Coco isn't all that bad. Luckily for her, the rest of the gang agrees with her on some level. While Coco Diablo is stuck in Coolsville State Penitentiary, Velma sends letters to the villain all throughout her stay, and even though she doesn't expect Coco to write her back, she finds herself getting letters back. What will happen when Mystery Inc needs Coco's help when Velma is kidnapped?