The Imposters Series by Roseanna M. White

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... moreLeft 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. less

As the leader of elite private investigative firm the Imposters, Lord Yates Fairfax has made an art of concealing his identity. But when his newest client, the beautiful Lady Alethia Barremore, is shot while leaving their meeting, he throws caution to the wind and rushes to her aid. Though Lady Alethia thought she was only looking for her missing former nanny, she has clearly stumbled upon dangerous secrets... moreAs the leader of elite private investigative firm the Imposters, Lord Yates Fairfax has made an art of concealing his identity. But when his newest client, the beautiful Lady Alethia Barremore, is shot while leaving their meeting, he throws caution to the wind and rushes to her aid. Though Lady Alethia thought she was only looking for her missing former nanny, she has clearly stumbled upon dangerous secrets.Lady Lavinia Hemming suspects there's more to her oldest friends than they're willing to admit, and when she stumbles upon the truth that they're the Imposters, she recruits herself into the firm. Happy as she is for the distraction of an investigation, Lavinia's own family secrets continue to haunt her. And the one thing to bring laughter back into her life--her friendship with Yates--lands her squarely on the bad side of her best friend, his sister.Tormented by a past that she doesn't dare to voice aloud, Lady Alethia does what she can to help her handsome host, her new friends, and the investigators. But as clues lead them deeper into the darkest of society's secrets, Alethia, Yates, and Lavinia soon learn anew that the gentry isn't always noble . . . and truth isn't always honorable. less