Dowser Tru Palmer is in the Nubian desert drilling for oil when she meets a Nubian woman named Efra who teaches her about her legacy as a Marian -- a group of powerful women descended from priestesses. Efra is keeper of a handful of mosaic tiles with the power to affect the earth and the people who hold them. When the tiles are stolen, Tru retrieves them with the help of Griffin Sinclair, a man hired to watch over her. Hidden Sanctuary (3), by Sharron McClellan, is another fast-paced novel in the Madonna Key series. The chemistry between Tru and Griffin is good, but the story could have used more in-depth description at times, especially when Tru is using her "talent" as a dowser.