Following Faces Under Water, Tanith Lee's alchemical thriller series continues with a Joan of Arc-inspired novel set in an alternate medieval Venice.   In Saint Fire, the second volume in the Secret Books of Venus series, Volpa is a strangely beautiful servant girl who glows with an inhuman inner flame. When her master, an abusive wood seller, is mysteriously incinerated, Volpa discovers her power of fire. Her gift is noticed by the Church leaders, who see her as a mighty weapon in their holy wars. This gripping fantasy of a mysteriously gifted Joan of Arc is stunning from beginning to end.   "Lee's writing is as entrancing as ever, full of evocative imagery and memorable characters. The questions she raises about faith and hypocrisy, fear and justice, are deftly rendered and not easily answered." --Publishers Weekly   "The author of Faces Under Water continues her saga of a city at the mercy of powers beyond its control. Lee's sensual and evocative storytelling imparts a dreamlike quality to this tale of transcendent faith and human passion." --Library Journal   "Evocative, and set forth in Lee's eerily crystalline prose." --Kirkus Reviews