Calypso loves the house on Grimsly Road where she lives with the two mamas. She doesn't even mind that a ghost lives there too - until he ruins their holiday cookie party. Doesn't he like holidays? or parties? or cookies?
Calypso hunts for answers, and clues turn up in unexpected places - like the local library, and the cemetery. With help from her new friend Abbey, Calypso is determined to solve the mystery. But time is running out, and it's almost Christmas. Will the ghost ruin their next party?