2010 answer: Visions in Death (runners up Witness in Death and Haunted in Death)
So, thinking about this, and it's really hard to pick just one book in this series. Visions in Death does have one of the hands-down best Peabody moments of the series.
Thinking about it, however, I think I'd want to go with Divided in Death. This is where the series went hardback, and it features a mystery that hits a lot closer to home than some. I'd pick this one, though, because I think it has one of the pivotal moments in the series - when Eve tells Roarke that he can't get vengeance for what happened to her when she was a kid, because if he does what he wants to do, it's murder committed in her name. (desert_sdwndr, guess which In Death title we'll be listening to?)
There's some honorable mentions, however. Memory in Death features another crime for Christmas, and has a bad guy you actually kind of sympathize with. New York to Dallas brings a lot of things full circle in a way that was true to the series that I really enjoyed. Celebrity in Death played off several of the others, including Origin in Death and Witness in Death, and was quite enjoyable.
Haunted in Death is still the best short story. The short stories incorporate too many paranormal slants for me to really enjoy, but Haunted in Death is a well-done ghost story and murder. It's a staple of car trips.
I've seen several In Death books over here, and everytime I do, I pick it up and look through it. It's like meeting an old friend and curling up for a chat.
( The Rest of The Meme )