Interlude

When Mia Cox finds out she can’t donate her kidney to save her younger sister’s life, she doesn’t hesitate to jump on a plane to New York, convinced she can talk their estranged birth mother, Carmen, into donating hers instead. She doesn’t know the city or how she’ll find Carmen when she gets there, but she has to try. If she doesn’t, Maddy’s going to die.

On the cross-country flight, Mia figures she’ll have more than enough time to make a plan for when she lands—where she’ll go, where she’...