Head of the Denver Pinkerton office Archie Gordon has been tasked with hiring female agents. The problem? They need to be trained by existing agents while solving cases. Alone and unchaperoned. In 1871. The solution? Have each pair marry temporarily, for the duration of the case. If Archie can convince his reluctant agents and the even more reluctant women to agree, that is.

When Harper Crane is nearly abducted outside the law office where she works as an administrative assistant, she’s grateful two police officers are there to rescue her. At seven months pregnant she has no idea why someone is coming after her, especially since her criminal ex-husband is dead. She wants nothing more than to return to her boring life, but the attacks against her escalate, giving her little choice but to accept Steele’s protection.

She's on the run from her cruel guardian... And Miss Adelaide has found the perfect hiding spot in the home of the formidable Earl of Tolston. But masquerading as a maid comes at a cost. One day she faints on the job, and when she wakes... She's in the arms of the Earl. His eyes are dark as he glowers down at her, but then he says, "What are you hiding, little one?"

In the eyes of London Society, Gillian Phelps is suitable enough. Though the ton whispers about her change of residence, any speculation remains just that: ballroom gossip. No one—not even the other Huntresses, the group of ladies she calls her dearest friends—knows that she is harboring a devastating family secret. Gillian has become adept at hiding the reality of her circumstances, but the close quarters of a house party will test her ability to conceal the crushing truth. And with so many people to deceive, the late arrival of another guest is a most unwelcome surprise.

Felicity Wren, a woman without family, is bound by societal expectations and a lonely past. Theodore “Tad” Hartford, the son of a successful merchant, is an outsider to the world of nobility. Their arranged marriage, a means to secure Felicity’s future and Tad’s ascension in Society, begins as a duty but quickly becomes something more.