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In this first part of a special two-part series, Mary-Kate and Ashley are off to Florida on a summer getaway with a group of students from White Oak and Harrington to study marine mammals, scuba dive, and have fun in the sun. But when Mary-Kate gets lost in the cypress swamps, only Ashley can save her.

Shore Thing 2001, Turtleback Books

ISBN-13: 9780613439572

Turtleback School & Library edition