This month's World Book Club comes from the church of St Mary Magdalene in Woodstock, England. Harriett Gilbert talks to Swedish superstar Henning Mankell about Faceless Killers, the first novel in his globally acclaimed series featuring Inspector Kurt Wallander. In it, an elderly farm couple is brutally murdered and the only clue is the wife's uttering of the word "foreign" before she dies. Wallander must find the killers before anger towards foreigners boils over. Hear about - and from - Wallander's female admirers around the globe all apparently queuing up to marry him, and about how Mankell plants deliberate errors - one in each novel - that no-one has ever spotted.