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The Tide Knot is the second book in the Inog series. Sapphire has moved away from the ocean and one night she hears her father's voice calling to her from the ocean. She is very curious about how this could be because everybody else thinks he drowned. The next time this happens, she goes down to the ocean to talk to him. He says that he misses her and they talk for a little bit. her father hadn't drowned, but a voice had pulled him to the ocean, and he agreed to be transformed into a mer-man, and married a mer-lady and they had a baby. Sapphire ends up going to Ingo again and she meets Faro's teacher. She learns about the Tide Knot, which makes the tides work. She leaves Ingo and goes back to the house. The next night, she hears her father again, and goes to talk to him and learns that the Tide Knot is about to break, and there will be a big flood. She goes home and talks to Conor about it. very soon, the flood starts. Her mother is sick, so Sapphire goes downstairs to get something for her mother. She notices that the floor is becoming wet. The flood is happening! The water is all murky and disgusting. Sapphire tries to open the closet downstairs to get the ladder to the attic. Sapphire ends up calling to Faro, and together they open the closet, save the family, and go fix the Tide Knot.