Seventeen-year-old Cordelia Koenig was sure of many things going into her last year of high school. For one, she wasn’t going to stress over the senior project all her peers were dreading—she’d just use the same find-your-roots genealogy idea that her older sister used for hers. Secondly, she’d put all that time spent not worrying about the project toward getting reacquainted with former best friend and longtime crush Kodiak Jones who, conveniently, gets assigned as Cordelia’s partner.

All she has to do is mail in her DNA sample, write about her ancestry results and breeze through the rest of senior year. Done, done and done.

But when Cordelia’s GeneQuest results reveal that her father is not the man she thought he was but a stranger who lives thousands of miles away, Cordelia realizes she isn’t sure of anything anymore—not the mother who lied, the life she was born into or the girl staring back at her in the mirror.

If your life began with a lie, how can you ever be sure of what’s true?