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 that reached a lifetime high during the pandemic, Harper joins her newfound half siblings on a voyage to Hawaii to face their father. The events of that summer, and 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?