Acts and the Third Gospel clearly come from the same hand. Not only their common dedication, but their common interests and their unity of language and style leave this beyond doubt. Moreover, the way in which they are introduced—the Gospel with its relatively detailed preface, Acts with its shorter introduction echoing the other’s language—points us to the fact that these are not simply two books by the same author, but two volumes of one book. This arrangement of a work into a number of “books” having a common preface, with the later books having their own brief introduction, was a not-uncommon feature of ancient writing (cf., e.g., Josephus, Against Apion 2.1–7; see BC, vol. 2, p. 491). Unlike the Gospel, there is no clear line of demarcation in Acts between the introduction and the na…