Delilah Dirk and the King's Shilling

Major Merrick, in league with the French, frames Delilah for treason. She pursues him to England and goes underground by resuming her life as a young woman of good family, passing off the appalled Mr. Selim as a servant. They discover that Merrick is attempting to sabotage a British fleet, then expose and thwart him. Due to his high position Merrick gets off, but common soldiers in Portugal snipe at him in battle until they force him into French lines, where he learns that the French have no use for an exposed spy. He vows revenge, while Delilah and Selim plan a boat trip to Scandinavia.