** spoiler alert ** 
 This book, of the three so far, is probably my least favorite. A lot happens, but I get less of a sense of Jacky. She's obviously growing up a bit, even though she's still capable of getting herself into scrapes. 
 Jacky gets back to England after a brief time on a whaling ship (the Pequod, where she snuggles up to a lad named Ishmael a time or two). She tries to get to Jaimy, but finds him flirting with a pretty girl. Jacky doesn't stick around to hear an explanation. In her escape, she gets caught by a press gang, thus landing her back in His Majesty's Royal Navy. 
 She's on-board a Hell Ship, a crazy captain who's being treated for illness with bloodletting and heavy metals. Yeah, that'll help. She resumes her position as midshipman, even though she's a girl. The captain doesn't care, though the rest of the crew does. She whips them into shape and, after a narrow escape from the captain's advances, takes over the ship. Knowing this can't go on indefinitely, she makes plans to get herself off-ship. They've captured prizes while standing blockade against French smugglers. Jacky helps herself to one of the ships and starts her life as a privateer, licensed by the government to take ships and goods from the enemy. 
 She makes lots of money for herself and her men, sets up an orphanage for her mates in London, and everything seems to be going fine, until she finds out she's wanted. . . 250 pounds sterling alive, 100 pounds dead. She tries to make a run for it, but gets caught. Jaimy's the one who sinks her ship. She's captured, they reunite while she's kept in the brig. She escapes during the Battle of Trafalgar (I think, though wikipedia says no British ships were lost in the battle, artistic license, perhaps), helps fight, then tries to slip away when the battle's over. She returns, however, when the ship starts to sink. She saves many men's lives, possibly at the cost of her own. The captain, however, sends her on her way, I assume in recognition for her actions that day. Last we see of Jacky, she's on her way to Boston.