In June of 1975, Ryan Baxter’s mom moves him and his brother, Matt, to the small seaside town of Bayport, MA to escape their abusive father. For an eleven-year-old, spending lazy days hanging out at the beach and the arcades sounds like a dream.
When he meets Leah and she agrees to be his girlfriend, Ryan is happier than he’s been in his young life. Then the “Sea Monkeys” knock-off he bought from the back of a comic book starts to grow…and grow and grow.
As Ryan and Matt struggle with their new lives and new friends, they begin to receive mysterious phone calls. As the sea monster in their house begins to get out of control, the real monster draws nearer to Bayport in the shape of their father.