At the end of book 2, Glory In Death, Roarke proposes to Eve. Throughout book 3, Immortal in Death, Eve is preparing for her wedding while she is trying to prove Mavis innocent of murdering a world-famous model. At the very end of Immortal in Death, Eve is dressed for her wedding and leaves the room "to make her promises" to Roarke. At the beginning of book 4, Rapture in Death, Eve and Roarke are on their honeymoon. There is no book that actually has them reciting their vows, but there are references once in a while about their wedding day. I've read all of the In Death books at least five times, so I can tell you that there is no actual taking of vows between Roarke and Eve.