Jazz, Sunny's sister, died in a fire in her apartment in New york.
Shortly after Jazz's death, Sunny's parents began to fall apart. Her father, Dan started to drink excessively and her Mother, Lily became depressed and started to take sleeping pills to try and get over her daughters death.
Sunny received a letter from her deceased sister. She thought it was a letter from before she died but the date was from a week ago.
Earlier Sunny was too afraid to read the letter. She found it frightening that she got a letter from her dead sister. After a while, she opened the letter and saw that her dead sister was coming back home soon.
it was a surprise when Jazz came back home. Sunny and her father realized that it wasn't her. She acted exactly like Jazz but something was just off with her.
Sunny's suspicions grew as the imposter knew everything about everyone. Sunny was determined to find out so she snuck into her room and read her diary.