Hierapolis in the Heavens is a project which brings together several articles and essays Kreitzer has written on the letter to the Ephesians and follows up a new suggestion he first put forward in 1997 as to the setting and provenance of the epistle. Nothing quite like this has yet been published on Ephesians, particularly as it does offer some important new archaeological, textual and numismatic evidence for scholarly consideration. The book should also be of interest to social-historians of the first-century world as it argues that the letter we know as Ephesians was written to what was, in effect, a daughter-church of the church in Colossae; some intriguing questions about power-relations between churches such as this are opened up as a result.