"Hal and the other Herons face many perils as they track down the pirates who stole Skandia's most prized artifact, the Andomal"--

Twig, a young sky pirate captain, is the only one who can save the floating city of Sanctaphrax from the Mother Storm.

Connor, who was rescued by pirates after his ship was wrecked, believes his twin sister, Grace, was abducted by the Vampirates and is determined to find her.

"Mabel Jones finds herself aboard the Feroshus Maggot--a ship crewed by the strangest bunch of pirates you'd (never) want to meet. She then has to find pieces of an X-shaped puzzle that in her hands could be her ticket home, but in the hands of Captain Split, they'd give him the power to assemble a pirate militia to take over London!"--

Visiting their uncle's seaside home for the summer, a brother and sister open a mysterious trunk in a back room and discover a sinister-looking pirate puppet that comes to life and takes them captive.

Rook Barkwater, one of the apprentices chosen to make a dangerous journey to study in the Deepwoods, joins the sky pirate Captain Twig in opposing the Guardians of the Night and learns more about his own past.

When a massive storm at sea blows the Brotherband crew off course to a land so far west Hal cannot recognize it from his maps, they face an unknown enemy.

While Connor faces trouble in the form of an obnoxious new crewmate, Grace, his twin sister, seeks out a vampirate guru who might be able to heal their dear friend Lorcan's blindness.

When the Pirate Federation and Nocturnals form an alliance to battle the renegade Vampirates, twins Connor and Grace Tempest each have important roles to play in the war--he as a pirate warrior and she as a powerful healer working with the war-wounded.

Recounts the further escapades of Hiccup Horrendous Haddock the Third as he continues his Viking training during which he escapes from a boatload of Roman soldiers and searches for his kidnapped dragon.