The Double-Dip Disguise: #8

Susan & Christine Pratt take a vacation on Seagull Island. Both twins decide to get summer jobs on the island to help pay for college. The summer is filled with mystery as the twins find out someone is polluting the local beach. Things continue to trouble the girls when Christine meets a mysterious stranger at the ice cream parlor where where she works, and Susan takes a babysitting job in a mansion with a forbidden wing. The twins switch places to solve each mystery. This is a great book which teaches kids to stand up for what is right and it is told in such a delightful way that they will want to read it again and again.