Another Grand Adventure in the Temeraire series.
The action starts in Japan, as Captain William Lawrence finds himself shipwrecked and has lost his memories of the last 8 years. Eventually Temeraire and the others find the Captain and they head off to China to enlist the help of the Chinese in the Brits fight against Napoleon. Then its off to Russia to help the Russians against Napoleon’s invasion. Unfortunately, the book ends on a cliffhanger, so hold on for the next volume in this wonderful series.