IN THE SUMMER OF 1999, the Holy Spirit directed Rick Karr, a 51-year-old Texan, to answer the calls made to a phone booth located in the middle of the Mojave Desert, 15 miles from a highway. He spent 32 days camping beside the phone booth on the desert playa in scorching heat. During that time he answered over 500 calls, many of which came from someone named Sergeant Zeno, who said he was phoning from the Pentagon.