Black Powder War by Naomi Novak

This book opens as Temeraire and Laurence prepare to leave China and return home to England, where Temeraire hopes to institute reforms in the ways the English treat dragons. However, their journey is delayed when they receive an order to retrieve three dragon eggs from Turkey, and further delayed when they find themselves forced to fulfill a promise that the British made to the Austrians but never followed through on. These double betrayals make the plot of the book a bit unstable, but it was a very enjoyable entry in an entertaining series.