Mia, the irreverent, hyperanalytical 20-year-old daughter of a biracial Korean American family in Virginia, has an explanation for everything --- which is why she isn’t initially concerned when her father and younger brother, Eugene, don’t return from a walk in a nearby park. They must have lost their phone. Or stopped for an errand somewhere. But by the time Mia’s brother runs through the front door bloody and alone, it becomes clear that the father in this tight-knit family is missing and the only witness is Eugene, who has the rare genetic condition Angelman syndrome and cannot speak. What follows is both a ticking-clock investigation into the whereabouts of a father and an emotionally rich portrait of a family whose most personal secrets just may be at the heart of his disappearance.

In a small town in Virginia, a group of people know each other because they’re part of a special treatment center, a hyperbaric chamber that may cure a range of conditions from infertility to autism. But then the chamber explodes, two people die, and it’s clear the explosion wasn’t an accident. A powerful showdown unfolds as the story moves across characters who are all maybe keeping secrets, hiding betrayals. Chapter by chapter, we shift alliances and gather evidence: Was it the careless mother of a patient? Was it the owners, hoping to cash in on a big insurance payment and send their daughter to college? Could it have been a protester, trying to prove the treatment isn’t safe?