When, one dark night in November, Prince Ludovico Ruspanti fell a hundred and fifty feet to his death in the chapel at St Peters, Rome, there were a number of questions to be answered. Inspector Aurelio Zen finds that getting the answers isnt easy, as witness after witness is mysteriously silenced - by violent death. Paperback , 416 pages Published December 30th 2010 by Faber and Faber (first published 1992)