"Stanley Yelnats’s family has a history of bad luck, so he isn’t too surprised when a miscarriage of justice sends him to a boys’ juvenile detention center, Camp Green Lake. But there is no lake—it has been dry for over a hundred years—and it’s hardly a camp: as punishment, the boys must each dig a hole a day, five feet deep, five feet across, in the hard earth of the dried-up lake bed. The warden claims that this pointless labor builds...

There's a storm brewing over Eerie-on-Sea, and the fisherfolk say a monster is the cause. Someone has woken the ancient Gargantis, who sleeps in the watery caves beneath this spooky seaside town where legends have a habit of coming to life. It seems the Gargantis is looking for something: a treasure stolen from her underwater lair. And it just might be in the Lost-and-Foundery at the Grand Nautilus Hotel, in the care of one Herbert Lemon, Lost-and-Founder....

Izzy joins Marina and the other mermaids at Hidden Cove for the Treasure of the Tides ceremony. But that sneaky snook Captain Hook has his eye on the mermaids' treasure! Can Izzy and the mermaids outwit Hook and keep the treasure safe?