You can read Paulo Coelho's book "The Valkyries" An Encounter With Angels, online at the link above.
This is a modern-day adventure story featuring Paulo's supernatural encounter with angels -- who appear as warrior women and travel through the Mojave desert on their motorbikes. Haunted by a devastating curse, Paulo is instructed by his mysterious spiritual master to embark upon a journey -- to find and speak to his guardian angel in an attempt to confront and overcome his dark past. The Valkyries is a compelling account of this forty day quest into the searing heat of the Mojave Desert, where Paulo and his wife, Chris, encounter the Valkyries -- warrior women who travel the desert on motorcycles, spreading the word of angels. This exotic spiritual odyssey is a rare combination of truth, myth, imagination and inspiration. Ultimately it is a story about being able to forgive our past and believe in our future.