When their father sends a letter saying he has remarried and no longer loves them, Annet and her sisters set out across the treacherous Sea of Teeth to find him in this second book in the Triplets Grim illustrated middle grade trilogy, perfect for fans of Coraline and the Sinister Summer series.

To save her father, she'll have to survive what lurks beneath.

Annet is in shock. She and her sisters, Hannah and Nell, have just read a letter from their father, who is away at sea. He says that he has a new wife and never wants to see his daughters again. The triplets are hurt and angry until Annet realizes that though it's their father's handwriting, the words aren't his. Convinced their father is in danger, the sisters sneak off across the deadly Sea of Teeth to rescue him.

Their journey is filled with peril, as the triplets look for help among the weird creatures at the Goblin Market, go sailing with pirates—both living and dead—and find themselves stranded in the middle of a sea filled with hungry mermaids. Annet is kind and clever and good at solving riddles, but will that be enough to outsmart a sinister sea witch and fight all the dangers of the deep?