Family of Liars by E. Lockhart

Family of Liars in the Prequel to We Were Liars. I strongly recommend that you read We Were Liars first or the book will be spoiled for you. 

Family of Liars is about the previous Sinclair generation. It takes place during the 1980s when they are teenagers.  We learn how their past shaped the future generations. We learn about the Sinclair sisters and get a better understanding of who they are as people. 

There are lots of secrets and lots of drama. This is a super fast, entertaining read.