Lock and Key is a novel written by author Sarah Dessen. It is her eighth published novel. It was published by Viking's Children's Books in 2008. Plot After her drug and alcohol addicted mother abandons her, child services forces 17-year-old Ruby Cooper to move in with her sister, Cora, who had left for college when Ruby was young. Ruby is upset about this arrangement and continues to wear the key to her old home on a chain around her neck. After learning she will be transferring to a new high school, Ruby attempts to run away but is found out. Nate Cross, Jamie and Cora's next-door neighbor, covers for her. Over the span of the story, Ruby slowly becomes closer to Nate. As Ruby adjusts to her new life, she learns Cora had not been avoiding her; in fact, Cora had been trying to rescue Ruby from their mother but had always been stopped. Ruby feels overwhelmed with all this, so she skips school to take alcohol and drugs, and later finds herself in Nate's car when he picks her up. Ruby comes home to a furious Jamie, who accuses her for being ungrateful to him and her sister. Having seen resemblances between herself and her mother that night, Ruby becomes determined to change her ways. One of Nate's clients, a high-strung woman named Harriet, offers Ruby a job at her jewelry store in the mall. Harriet's business booms after a line of key-shaped pendants, inspired by Ruby's necklace, becomes an instant hit. Harriet struggles with a conflict of her own: Because of her independence, she is reluctant to form a relationship with Reggie, who owns the kiosk next to her. Throughout the story Ruby becomes suspicious about Nate's father, and eventually learns that he abuses Nate. Nate is defensive about this, and that leads to them fighting and breaking up. One day, Cora and Jamie inform Ruby that the police had found her mother unconscious in a hotel room and sent her to a rehabilitation center. Later, Ruby finds out that Nate has run away, but finds him in an apartment room that she and Nate had visited while she was tagging along with him on his job. Ruby drives Nate to the airport when he decides to leave his father to live with his mother. After a sudden realization, she takes the key to the yellow house off