My Lord, My Rogue by Anna St. Claire

Lady Honora Radcliff was betrothed to the most sought-after man of the Season— just not the man she loved. Too much champagne and too many dances with a handsome stranger leaves her life in tatters and she finds herself married to an abusive man whose only interest is the dowry her father refuses to release. Desperate to save her life and that of her unborn child, she fakes her death and disappears.
Lord Benjamin Crewe, the Marquess of Willington, planned to enjoy the Christmastide season relaxing. Instead, he accepts a dangerous assignment from the Crown and while working it, comes face to face with the woman he always wished he had married. Only she has been thought dead for three years.
Needing answers, he pursues her at the same time a treacherous enemy of England surfaces, and the two of them become tangled in a web of danger, espionage, and deception.
Can Honora and Benjamin survive the danger in which they find themselves and gain a chance for love and happiness?

(Previously released in Hello Rogue, anthology.)