It's July on Cape Cod, and fourteen-year-old Willa Havisham isn't so happy about her boyfriend, JFK, being away all summer at baseball training camp. With best-friend Tina and Ruby edging her out lately, Willa wonders what the summer will bring. It turns out there are plenty of surprises in store! For one, there's been a mermaid sighting. There's also a boy named Will who claims to be her long-lost brother. He shares Willa's sea-blue eyes, but Willa wonders what secrets he's hiding and what this news will mean for her famous wedding planner mother. It's going to be a summer filled with fireworks for sure!