That summer, Cadence has a swimming accident resulting an un-diagnosable brain injury, which causes her to have gaps in her memory and gives her migraines afterwards. Still, Cadence and Gat continue to flirt and occasionally kiss. When Cadence returns to the island the next summer (' summer 15'), Gat has a girlfriend back home. The following year, Tipper passes away and Cadence's parents divorce.

The summer the Liars are all 14 (' summer 14'), Cadence and Gat starts developing feelings for each other. Together, these four (Cadence, Johnny, Mirren and Gat) hang out together during the summer and have been nicknamed the Liars by the family. Johnny's mother also dates an man named Ed, whose nephew Gat Patil is their age as well. There are two other grandchildren who are Cadence's age - Johnny and Mirren. The Sinclair family spends each summer on Beechwood Island, a small private island where Harris has built four summer homes, one for him and his wife Tipper and other three for each of their three daughters ( Penny, Bess and Cassie). Everyone in the Sinclair family is blond and athletic, and their patriarch is Cadence's grandfather Harris, who is the one who made the family fortune that they all live off of. In Part I, the book introduces Cadence Sinclair, who is the eldest granddaughter in the wealthy and beautiful Sinclair family. The migraines and memory loss were a result of her guilt and inability to face the truth. However, it went poorly and the other teens died in the fire. Finally, in the end, Cadence remembers that she and the other teenage grandchildren had decided to burn down their grandfather's house when it was empty in anger over being dragged into their parents' fights over money.

She slowly recalls her bits pieces of fights between her mother and aunts over inheritances and assets, fueled by her grandfather pitting them against one another. Two years later, she returns to the private island determined to figure out what happened that summer. The summer she is 15, she has an accident that leaves her with a brain injury, with migraines and gaps in her memory. They spend their summers on their private island. One paragraph version: Cadence Sinclair comes from a family of wealthy and beautiful people.

We were liars about