The Jellyfish Problem by Tessa Yang is a magical mystery.
Jo Ness has been grieving the loss of Aldo; he was her best friend and coauthor of their book about jellyfish. His death occurred during a dive together, and Jo has been haunted by his loss since.
Her college friend and love interest, Nadia, reaches out to her after eleven years without communication. There is a giant jellyfish in the water off the tiny Maine island where Nadia lives. She hopes Jo can bring her jellyfish expertise to help the island residents.
The jellyfish, called Clementine, has an invisible hold over everyone who has seen it. This hold prevents them from leaving the island or destroying her, and its boundary appears to be narrowing.
Jo faces visions of Aldo’s ghost and the interesting collection of island residents (including a potential love interest) to figure out how to release Clementine’s hold.
There are interesting snippets from Jo and Aldo’s book throughout the story which enhance the tale.