Do you know who wrote Mark's Gospel? At first glance, it may seem a ridiculous question. 'Mark, of course!' I hear you shout? But who was Mark? Mark's name doesn't appear on the list of disciples, as Matthew's does. His Gospel doesn't start with a clear statement of investigation, as does Luke's, offering credibility. Yet, remarkably, large chunks of Mark's Gospel appear in both Matthew's and Luke's work. What's going on? Jeremy Duff provides insightful answers in his new book Peter's Preaching, revealing how an ancient source describes Mark as Peter's translator to a Greek-speaking world. Intriguingly, though, this source also tells us that while Mark recorded Peter's preaching 'accurately', he did not record it 'in order'. Mark devised his own order of the stories, for his own purpose, using a structure and format that were as radical in the first century as ebooks are today. But that is only the start of Jeremy's detective work in this stimulating book, which moves on to uncover Peter's thought on the key themes of the Christian message, found distributed throughout the Gospel. Jeremy pieces these themes together like a jigsaw to reveal how Peter understood them, and how that understanding helps us to appreciate the radical nature of first-century Christian faith.