The story is told from the perspective of Herbert Lemon, the Lost-and-Founder of the Grand Nautilus Hotel, who tries to unite objects that have been left at the hotel with their owners.

"It's winter in the town of Eerie-on-Sea, where the mist is thick and the salt spray is rattling the windows of the Grand Nautilus Hotel. Inside, young Herbert Lemon, Lost and Founder for the hotel, has an unexpected visitor. It seems that Violet Parma, a fearless girl around his age, lost her parents at the hotel when she was a baby, and she's sure that the nervous Herbert is the only person who can help her find them. The trouble is, Violet is being pursued at that moment by a strange hook-handed man. And the town legend of the Malamander -- a part-fish, part-human monster whose egg is said to make dreams come true -- is rearing its scaly head. As various townspeople, some good-hearted, some nefarious, reveal themselves to be monster hunters on the sly, can Herbert and Violet elude them and discover what happened to Violet's kin? This lighthearted, fantastical mystery, featuring black-and-white spot illustrations, kicks off a trilogy of fantasies set in the seaside town. A quirky, creepy fantasy set in Eerie-on-Sea finds a colorful cast of characters in hot pursuit of a sea monster thought to convey a surprising gift."--provided by publisher.