The Jesus Christians are unusually committed to their faith. They give up everything they own - including, now, their spare kidneys. For the past year, journalist Jon Ronson has exclusively followed the group as they attempt to donate their kidneys to strangers in the UK and the US. But who should they give them to? Where can they advertise? Will the hospitals, the media, and the potential recipients see their gesture as a miracle, or as the self-destructive act of a controversial religious movement?