"Mabel likes to keep an eye on all the comings and goings at the Mermaid Hotel. When a mysterious old lady moves in, with a jewel-filled trunk and a beady-eyed pet tortoise, Mabel vows to watch her every move. Because this guest, Mabel decides, is a supervillain. But even supervillains have a soft side, and as an unlikely friendship grows between the pair, their fantastical exploits take them well beyond the corridors of their hotel home"--Dust jacket flap.
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