The Callahan cousins are back for the second installment of their adventure-filled vacation on beautiful Gull Island. Grandmother Gee has given Neeve, Hillary, Kate, and Phoebe permission to fix up and move into the Dorm—their very own quarters separate from the main house! But in the midst of their redecorating mania, Neeve stumbles upon a troubling family secret that she's reluctant to share, even with her cousins.