The World of Emily Windsnap: Emily's Big Discovery (The World of Emily Windsnap)

"Even though she lives in a houseboat, Emily Windsnap doesn't know how to swim...Standing beside the pool, she feels the water calling her, but when she jumps in, she gets a strange, kind of scary sensation...like her legs are stuck together...Emily later dives into the sea. She gets that weird feeling again, but this time she looks down to see that her legs are gone--replaced by a shiny, beautiful tail"--