“Find Me,” a new novel by Laura van den Berg, is presented in a deceptively simple, straightforward style. Written in present tense by its protagonist, a young woman named Joy, often relying on facts and lists, she first exposes her attitude about her involuntary quarantine in a hospital, following an epidemic, which first robs people of their memories, then their lives. She’s one of the few immune. But as the story unwinds, another, even more traumatic fact about her life appears. Abandoned as an infant, she’s lived in a series of foster homes, and the occurrences there left indelible marks that she accepts with equanimity. So we think. By the book’s end, we begin to question her view of reality and hopscotch back to previous scenes trying to dig out truth.