The Gentleman Spy by Georgina North

Beau has been a spy for years, escaping all the expectations heaped on him as a future duke. He's abroad when his father dies and manages big things from away, but Emerald, his father's—now his—ward, has actually taken on the day-to-day operations in his absence. When he finally returns (after an injury), Emerald is pissed that he's swooped in and taken away her work, and that he's still as handsome as he was when she was younger and had a crush on him.

They're clashing all the time about the estate, and Emerald is curious and suspicious about why he keeps running off in the middle of the night. At the same time, they're fighting their attraction to each other. But will Beau's spy past come back to haunt him and threaten Emerald?

This slow-burn, suspenseful historical romance is swoony and delightful, and it's available on KU now!