Delilah Dirk and the King's Shilling (Delilah Dirk #2)

After being falsely accused of spying by the nefarious Major Merrick, Delilah Dirk and Mister Selim sail to England to clear her name (and beat the tar out of the Major while they're at it). But once on her home turf, Delilah encounters an adversary mightier than the entire British Army: her mother.