The Mercy Makers — Tessa Gratton

A talented heretic must decide between the pursuit of forbidden magic, or the ecstasy of forbidden love -- either way, her choice will upend the world, in the start of a sweeping, romantic epic fantasy trilogy by New York Times bestselling author Tessa Gratton.

Can an empire trip and fall on a mere strand of silk? 

Iriset is a prodigy and an outlaw. The daughter of a powerful criminal, she dons her alter ego Silk to create magical disguises for those in her father's organization, but she longs to do more with her talent: to enhance what it means to be human by giving people wings, night-sight, and other abilities; to unlock the possibilities of gender and parenthood; to cure disease and even to end mortality itself.
 
Everything changes when her father is captured and sentenced to death. To save him, Iriset must infiltrate the palace and the empire's fanatical ruling family. There, she realizes she has a chance -- and an obligation -- to bring down the entire corrupt system. She'll have to entangle herself in the lives of the emperor and his sister, getting them to trust and even to love her. But love is a two-way street, and Iriset's own heart holds the most mysterious and impenetrable magic of all.