Darkborn Series by Alison Sinclair

For the Darkborn, sunlight kills. For the Lightborn, darkness is fatal. Living under a centuries-old curse, the Darkborn and the Lightborn share the city of Minhorne, coexisting in an uneasy equilibrium but never interacting. When Darkborn physician Balthasar Hearne finds a pregnant fugitive on his doorstep just before sunrise, he has no choice but to take her in. Tercelle Amberley's betrothed is a powerful Darkborn nobleman, but her illicit lover came to her through the daytime... moreFor the Darkborn, sunlight kills. For the Lightborn, darkness is fatal. Living under a centuries-old curse, the Darkborn and the Lightborn share the city of Minhorne, coexisting in an uneasy equilibrium but never interacting. When Darkborn physician Balthasar Hearne finds a pregnant fugitive on his doorstep just before sunrise, he has no choice but to take her in. Tercelle Amberley's betrothed is a powerful Darkborn nobleman, but her illicit lover came to her through the daytime. When she gives birth to twin boys, they can see, something unheard of among the Darkborn. When men come for the boys, Balthasar is saved by the intervention of his Lightborn neighbor-and healed by the hands of his wife, Telmaine. Soon he finds himself drawn deeper into political intrigue and magical attacks, while Telmaine must confront a power she can no longer keep sheathed in gloves, a power she neither wants nor can control. less

The second book in the Regency-flavored fantasy trilogy of magic and manners from the author of Darkborn. The Darkborn aristocracy has rejected magic, viewing the pursuit of science as the only worthy goal. But Lady Telmaine Hearne does not have that luxury. She has kept her own powers secret, fearful of being ruined in society...until her husband Balthasar draws her into a conspiracy to protect the archduke and his brother against a magical enemy. But who will protect them from her?

From the author of Lightborn, the third book in a Regency- flavored fantasy series of magic and manners. Magic dies with the mage, or so the Darkborn believe. That's why Lady Telmaine Hearne has been condemned to death for sorcery. She's escaped but is now bound with her mageborn allies for the Borders and war. Meanwhile, her husband, Balthasar, has learned of his family connection to the Shadowborn-and is fighting for survival and sanity as magic turns him against everything he holds dear.