Calypso loves the new-old house she lives in with her two mamas. She doesn't even mind that a ghost lives there too -- until the ghost ruins their holiday cookie party. Is there something he doesn't like about parties? Or holidays? Or cookies? With help from the two mamas and her new friend Abbey, Calypso searches the internet, the library, and the local cemetery for clues, determined to solve the mystery -- before the ghost ruins their next party!