Blood of tyrants / Novik, Naomi

Lawrence is shipwrecked in Japan...alone! Old enmities and suspicion are a waiting powder keg. Temeraire will unwittingly ignite the gunpowder to blow up the keg by providing new enemies for Britain when it desperately needs friends. Napoleon has turned on Moscow and is about to invade with an army of unimaginable size. If Russia falls, Britain could easily follow.

Shipwrecked and cast ashore in Japan with no memory of Temeraire or his own experiences as an English aviator, Laurence finds himself tangled in deadly political intrigues that threaten not only his own life but England's already precarious position in the Far East.