What is the plot of we were liars?

"We Were Liars" by E. Lockhart follows Cadence Sinclair, a privileged teenager who spends her summers on her family's private island. After a mysterious accident leaves her with memory loss, she returns to the island two years later to uncover the truth about what happened. As she reconnects with her beloved cousins and their friend Gat, dark family secrets and the nature of love and betrayal are revealed. Ultimately, the novel explores themes of privilege, trauma, and the complexity of relationships.