Cooney, who has a great interest in families pushed to the edge by anomalous situations, tells the story of best-friend first cousins and a third girl who realizes that she has a surprising connection to both of them. Missy, outgoing and un-academic, talks her quieter and more studious cousin Claire, whom she closely resembles physically, into pretending to be her twin for an unusual class assignment—to create a believable hoax. The tension gears up when the hoax video goes viral and catches the eye of a third girl, who bares an uncanny resemblance to the two cousins. Their meeting and the secret the three girls eventually unearth changes their notion of self and the shape of their families. Cooney devises copious explanations to give her tale credibility, but it's a hard story to swallow. However, the ending, full of good intentions yet unresolved and uncomfortable feelings, is thoughtfully realistic. (Fiction. 12 & up)
