We Were Liars

We Were Liars is a young adult novel written by E. Lockhart.

Description
"We Were Liars focuses on the theme of self-acceptance, family morals, and the possibly-deadly consequences of one's mistakes. It is centered on the wealthy, seemingly perfect Sinclair family, who spend every summer gathered on their private island. However, not every summer is the same—when something happens to Cadence, during the summer of her fifteenth year, the four "Liars" (Cadence, Johnny, Gat and Mirren) re-emerge two years later to prompt Cadence to remember the incident." - We Were Liars, Wikipedia 