Four teenagers, four different ways of seeing the same island. Cadence, Johnny, and Mirren belong to the Sinclair family; Gat enters their world through a family connection. Away from the adults, they form their own intense summer family.
The group is built on shared history: swimming, jokes, arguments, books, and long days with few rules. Gat's questions about wealth challenge the others, while Cadence's feelings for him make the group more complicated. Johnny brings boldness; Mirren brings empathy.
The Liars matter because they offer Cadence a version of herself beyond the Sinclair expectations. Their friendship becomes the emotional center of the novel—and the key to understanding why one missing summer carries so much weight.