Harper Proulx has lived her whole life with unanswered questions about her anonymous sperm donor father. She's convinced that without knowing him, she can't know herself. When a chance Instagram post connects Harper to a half sibling, that connection yields many more and ultimately leads Harper to uncover her father's identity. So, fresh from a painful breakup and still reeling with anxiety, Harper joins her newfound half siblings on a voyage to Hawaii to face their father. The man they discover–a charismatic deep-sea diver obsessed with solving the mystery of a fragile sunken shipwreck–will force Harper to face some even bigger questions: Who is she? Is she her DNA, her experiences, her successes, her failures? Is she the things she loves, or the things she hates? Who she is in dark times? Who she might become after them?