Death on Delos is the seventh adventure for Nicolaos and Diotima, and as you can tell from the cover, Diotima is slightly pregnant!
I won't summarize the book for you, because the highly esteemed Publishers Weekly has done a sterling job of describing the opening disasters in their review, which you will find to the right.
You might notice it's a starred review. It's also the seventh straight starred review for this series. That's kind of a big thing in the publishing world.