It's been a year since Luna's mother, the fashion-model wife of a successful film director, was hit and killed by a taxi in New York's East Village. Luna, her father, and little brother are still struggling with grief.

But when Luna goes to clean out her mother's old studio, she's stunned to find her mom's old cell phone there--charged and holding seven unheard messages.

As Luna begins to listen, she learns more about her mother's life than she ever wanted to know . . . because the tidy...