Family Of Liars By E Lockhart

(New, paperback)
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(We Were Liars  # 0)
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The prequel to We Were Liars takes readers back to the story of another summer, another generation, and the secrets that will haunt them for decades to come.
A windswept private island off the coast of Massachusetts. 
A hungry ocean, churning with secrets and sorrow.
A fiery, addicted heiress. An irresistible, unpredictable boy. 
A summer of unforgivable betrayal and terrible mistakes.
Welcome back to the Sinclair family. 
They were always liars.