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Christina, Grant, Mimi and Papa fly the Mystery Girl and take the mystery boat, Mimi, to all the Great Lakes on a wild and watery, adventurous mystery of shipwrecks, haunted lighthouses, and island intrigue!.

Siblings Grant and Christina spend their summer vacation exploring the Great Lakes with their grandparents, Mimi and Papa, but along the way, the family encounters mysteries involving shipwrecks, haunted lighthouses, and island intrigue.