We Were Liars by E. Lockhart

Secrets, secrets, secrets! “No one is a criminal. No one is an addict. No one is a failure.” Our narrator, Cadence, guides you through these three lies, the first of many,

into a twisty dark plot of what really happened that summer between three cousins and an handsome outsider. Or so you think...

Spending the summers on her wealthy family's private island off the coast of Massachusetts with her cousins and a special boy named Gat, teenaged Cadence struggles to remember what happened during her fifteenth summer.