On her birthday, Sarah receives a genetic testing kit from her closest friend, Victoria, as a present to explore her family history. Tragically, Victoria is murdered that same night. A few weeks later, the police visit Sarah, revealing that their investigation into the homicide had stalled. They decided to use the genetic testing site’s database to search for the killer’s DNA, and it matched with Sarah’s. This discovery suggests that a relative of Sarah’s is responsible for Victoria’s murder, but the question remains: who is it?