Synopsis from Goodreads

An edge-of-your seat psychological thriller with a romantic twist On the three-month anniversary of her boyfriend Flynn’s death, Morgan uploads her only photo of him to FriendShare to get some closure—but she’s shocked when the facial recognition software suggests she tag him as "Evan Murphy." She’s never heard of Evan, but a quick search tells her that he lives in a nearby town and looks exactly like Flynn. Only this boy is very much alive. Digging through layers of secrets and lies, Morgan is left questioning everything she thought she knew about her boyfriend, her town, and even her parents' involvement in this massive web of lies.