Looking back on his youth from a heaven unconstrained by time, the angel Gabriel writes his memoir to recount his spiritual formation on Earth with the Hanson family. Sent in 2015 by the Trinity to the Philadelphia suburbs as a guardian for a grieving boy, Gabriel, himself, grows up through both sorrowful and lighthearted experiences with mortals before traveling back through the ages to announce Christ’s birth. Appearing first as a babysitter named Debbie, Gabriel arrives on Earth to help with five-year-old Jon’s birthday party. During the celebration, tragedy strikes. Gabriel wings back to heaven for guidance and returns to Earth as elderly, homeless Dave Kryzinsky to fulfill his mission—an assignment that includes defeating the resident fallen spirit, Mourning. What does Gabriel learn from family life?