Sixth-grader Iris Abernathy hates life in Corvallis, Oregon, where her family just moved. It's always raining, and everything is so wet. Besides, nothing has felt right since Iris's best friend, Sarah, died.
When Iris meets Boris, an awkward mouth-breather with a know-it-all personality, she's not looking to make a new friend, but it beats eating lunch alone. Then she learns that Boris's very existence is a medical mystery, maybe even a miracle, and Iris starts to wonder why some people get miracles and others don't. And if one miracle is possible, can another one be too? Can she possibly communicate with Sarah again?