Under the Jolly Roger: Being an Account of the Further Nautical Adventures of Jacky Faber is a young adult historical fiction novel by L.A. Meyer and is the third book in the Bloody Jack series set in the early 19th century.
It is followed by In the Belly of the Bloodhound (2006), Mississippi Jack (2007), My Bonny Light Horseman (2008), and Rapture of the Deep (2009), The Wake of the Lorelei Lee (2010), The Mark of the Golden Dragon (2011), Viva Jacquelina!
She is confused until the family maid, named Hattie, tells her not to believe her and that Jaimy will be at the races at Epsom Downs.
They tell her a former member, Judy was hired to be a helper to an older woman, and despite her promises, has not come back to help the gang.
Thinking that was odd, Jacky goes to visit her and discovers Judy is being forced to work at a wash house for a terrible man.
She runs away and is captured by a press-gang who mistake her for a boy and take her aboard a ship, HMS Wolverine, where Jacky furiously reveals that she is a girl.
Jacky, knowing what the Captain has in mind, jumps from the ship into the sea, in an attempt to swim to safety.
As the boat creeps up on her, Jacky tries to stop them by going under water and pulling at an oar, causing a sailor to fall out.
His mother hears how the maid, Hattie, told Jacky where Jaimy would be and tells her to leave.
Hattie is mad that she would throw her out after many years of service and tells Jaimy to look in one of his mother's drawers.
Jacky decides to climb even higher to make sure not anymore line is chafing, even though that's Jared's job.
A member of the crew, wanting to protect Jacky, begins dropping cannonballs from the rigging on to the quarterdeck.
Along with Higgins, a steward from the Wolverine, Jacky travels to Ireland and finds her former sea dad, Liam Delaney and offers him the role as Captain of the Emerald, while she remains owner of the ship.
When the Emerald is at a port in England Jacky is relaxing in the countryside and an older man approaches her.
This is the first family Jacky has had since the dark day when her parents and sister died and she was forced out on the street.
Though Jacky has acquired a letter of marque by revealing the smuggling ring to the Admiralty, the latter brands her as a pirate when they learn she kept the Emerald for her own use.
The two rekindle their relationship; however, the Wolverine becomes engaged in the Battle of Trafalgar where Jacky escapes the brig and takes part in the fighting.
When all is over, she requests to stay and help doctor many of her former shipmates who had been injured, but the Captain sets her free for her bravery in battle.
Kirkus Reviews referred to the novel's main character, Jacky, as "plucky, smart and like all real heroes, good at everything she puts her hand to".