Left with an estate on the brink of bankruptcy after their father's death, Lady Marigold Fairfax and her brother open a private investigation firm marketed to the elite . . . to spy on the elite. Dubbed The Imposters, Ltd., their anonymous group soon becomes the go-to for the crème of society when they want answers delivered surreptitiously. But the many secrets Marigold learns about her peers pale in comparison to her shock when she and her brother are hired to investigate her best friend's father as a potential traitor.

Sir Merritt Livingstone has spent a decade serving the monarch in the most elite guard, but when pneumonia lands him behind a desk in the War Office Intelligence Division just as they're creating a new secret intelligence branch, he's intent on showing his worth. He suspects a man of leaking information to Germany as tensions mount between the two countries, but needs someone to help him prove it, so he turns to The Imposters, Ltd.

No one knows who they are, but their results are beyond compare. Lady Marigold is determined to discover the truth for her friend's sake, and she's more determined still to keep her heart from getting involved with this enigmatic new client . . . who can't possibly be as noble as he seems.