Kachina. The Dark Kachinas, #1

Remembering five missing weeks can save one world and doom another. When David Purcell is rescued from a cave, he is missing for five weeks and has no memory of his time in the cave. He is also free of any signs of starvation, injury or cave blindness. Adam Maho is an elderly Native American who has seen visions of Kuskurza, the Third World of Hopi creation stories. Adam's visions show him that the ancient evils that have been long-believed dead were imprisoned and not destroyed. If the weakening prison fails, the dark kachinas will be free to once again bring death and devastation to the world.
David is the key to keeping the dark kachinas imprisoned, and the dark kachinas have sent the Bow Clan on a suicide mission to kill him. David has flashes of memory from his time in the caverns, but he can't believe what Adam tries to explain to him. When David becomes a suspect in the murder the Bow Clan commits, he flees to the Hopi settlement of Oraibi. The Bow Clan pursue him and capture Adam's granddaughter.
David turns the tables on the Bow Clan and takes the fight to them as he remembers more of his time in the caverns. He journeys to Kuskurza on a rescue mission and to find a way to stop the dark kachinas.