When mysterious letters arrive the summer before her senior year, Kenna follows the riddles within that hint at her 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 government medical testing facility where she quickly becomes an unwilling test subject. Join Kenna and Jake as each letter reveals a truth from both of their pasts.