The Falcon and the Flame by Jolie Dvorak

She came to start a revolution. She found a queen worth dying for.

British secret agent Lottie Finch is smart, dangerous and loyal to no one—until she meets the one woman who can bring her to her knees. It’s just Lottie’s luck that woman is also her target.
Sent to infiltrate a royal harem and steer a reluctant princess toward the throne, Lottie is ready to charm, lie, and seduce her way to success—just as she does for every mission—but the Qasira Zynara is no pawn.
Brilliant, guarded, and utterly disinterested in ruling, Zynara has built her life around science and innovation, not politics. The last thing she needs is a flirtatious foreigner with a smirk full of secrets—no matter how gorgeous she is.
A high-stakes battle for the soul of a powerful nation sees Lottie and Zynara dance the razor’s edge between duty and desire—but plotting in the shadows is one mad prince who will stop at nothing to seize the crown.

Falling in love was never part of the plan. It might be the only way to save their lives.