The Twin Souls Books in Order

Captain Richard Ford commands Spite, the first royal airship, designed to defeat the king's enemies and flying monsters. Its maiden voyage appears successful when a wyvern is struck down, but the missing body leaves the victory uncertain.

General Dartan commands the Sorian defenders of South Sea Pass as King Markel's army lays siege. Confident despite the enemy's two divisions, he faces dangers his defenses did not anticipate when treachery and airships alter the confrontation.

Captain Ford and Spite's companions are ordered to capture a wyvern in the frozen north. Contradictory demands from the king and queen over Crown Prince Nestor, alongside the absence of a crew, make their new mission perilous.

Ellen and Princess Imay believe the dragon Jarin has saved them from their enemies. Trapped in a room filled with gold, they discover that their protector has become a raging creature, forcing them to confront a new threat.

King Markel prepares to conquer Soria with two airships spreading destruction from above. Rabel, young Ellen, and the dragon Jarin must seek allies and find a way to oppose the machinery and armies of an entire kingdom.

Ellen Ford has sworn loyalty to the dragon god Ophidian and is learning both magic and witchcraft from Rabel. After resisting Kingsland with her companions, she must consider whether their limited success fulfills the obligations of her oath.

Imprisoned and condemned to death, Rabel believes the loss of his family and forge has left him nothing worth saving. A visit from a young spy changes that conviction, confronting him with the choice of taking Ophidian's oath.

The mechanical immortal Ibb remains crushed as Kingsland's army advances into Soria. Ellen, Annabelle, Rabel, and the dragon god Ophidian attempt to restore him, facing questions about what bringing their companion back to life will cost.

Captain Ford's release of the imprisoned sea god Arolan also frees the dangerous snow serpent Pallas. To prevent the world from freezing, Spite's crew must cooperate with former enemies, including the wyvern they were previously ordered to kill.

King Markel rewards his soldiers after taking South Sea Pass, but Colonel Thomas Walpish distrusts his gift of a crimson jacket. An assassin's magical crossbow bolts and instructions to target crimson-clad men reveal a new layer of royal treachery.

Bullied and treated as cursed, sixteen-year-old Krea struggles to survive outside the capital. Finding the dying wyvern Wymarc presents her with a life-changing offer: become the creature's new twin soul, despite the uncertain dangers of accepting.

Krea's bond with a wyvern introduces her to the responsibilities of sharing a soul. Summoned before the gods sooner than expected, she faces their judgment and the possibility that rejection could determine the future of her unusual existence.

Krea has joined her soul with Wymarc after the royal airship Spite killed the wyvern's human counterpart. As the ship pursues them into the frozen north under King Markel's orders, its crew approaches a dangerous confrontation with their quarry.

King Markel's war expands into Soria while new railways support his advancing armies. Skara Ningan and Thomas Walpish continue their uneasy alliance, bound by an oath to destroy the maker of the dark tooth amid royal deception.

Steam Master Torvan Brookes needs more mages to meet King Markel's demands for expanding railways. Meanwhile, Mage Margen weighs teaching renegades the magic needed to oppose Vistos, and Ellen Annabelle discovers abilities whose consequences she must face.

Mage Vistos continues enslaving followers through poisoned sweets despite Thomas and Skara's efforts to stop him. Elsewhere, Alain and his centaur sister seek a future on the plains while powerful enemies pursue the remaining centaurs during the widening war.

With King Markel ruling both Soria and Kingsland, Torvan Brookes answers his adopted daughter's summons to Korin's Pass. A proposed exchange of gold for dragon steel promises opportunity, but the visit brings complications in the aftermath of conquest.

Mage Margen and spymaster Peter Hewlitt investigate alarming developments involving their students. Jarin Reedis seeks the dragon god Ophidian, whose reluctant revelations about twin souls and riders unfold alongside discoveries about Alain's past and an offer from the moon goddess.

As Markel's forces approach the Sorian capital, shortages and betrayal undermine his campaign. Skara Ningan and Thomas Walpish seek help against Vistos, a mage using magic to enslave others while receiving support from a powerful god with separate ambitions.

King Markel prepares for a joint coronation with Queen Rassa after conquering Soria, but their realm remains unsettled. A daughter's search for her missing father and an investigation into a destroyed caravan reveal unresolved troubles beneath the celebration.