Where Are You by Sally Bryan

As a shy student at Cambridge, Erin unexpectedly falls for the confident and captivating Gianna, only for her first love to disappear without a trace. Ten years later, Erin is a successful doctor who has carefully rebuilt her life, but memories of Gianna still linger.

When fate offers the possibility of a reunion, Erin must decide whether to protect the life she's created or risk everything for a second chance with the woman who never truly left her heart.