Night of Power by Spider Robinson

Spider Robinson being known for his Callahan's Place series of bestseller novels, the most recent of which is Callahan's Con (Tor). He co-wrote the Hugo and Nebula Award-winning Stardance series with his wife, Jeanne, which Baen recently published in one volume for the first time. Since his first pieces, which won him the John Campbell Award for best new writer, he has been a fan favorite. Since then, he's won a slew of other accolades for his witty, Heinlein-inspired science fiction, including three Hugos and a Nebula Award. He attends SF events all around the United States and Canada on a regular basis. Very Bad Deaths, an spinoff of the Callahan series, was his last book for Baen.