When mysterious letters arrive the summer before her senior year, Kenna, the daughter of an alcoholic single mother, follows the riddles within that hint at her absent father's existence. Kenna with the help of her best friend, Jake, head to New York City using each letter as their tour guide. The rabbit hole leads them to a family she didn't know she had, as well as a secret government medical testing facility. Kenna becomes an unwilling test subject herself as she searches for her father and his reasons for leaving her mother. Join Kenna and Jake as each new letter reveals a truth from both of their pasts. As their quest turns into a lab experiment gone wrong, Kenna must dig into her father's past to save not only herself but her family as well.