When Lord Meriwell collapses and dies at his dining table, Barnaby and Penelope Adair are summoned, along with Inspector Basil Stokes, to discover who, how, and most importantly why someone very close to his lordship saw fit to poison him. When Lord Meriwell dies at his dining table, Nurse Veronica Haskell suspects foul play and notifies his lordship’s doctor, eminent Harley Street specialist Dr. David Sanderson. In turn, compelled by a need to protect Veronica who is at Meriwell Hall as David’s behest, David calls on his friends Barnaby and Penelope Adair for assistance.

When Lady Henley Killigrew's father dies and his title of earl passes to a not-so-friendly cousin who wants her and her two younger sisters out of their elegant London townhouse, she takes them to Moonstone Cottage, a lovely manor house they inherited from a maiden aunt in the Cornwall seaside village of Moonstone Landing. But their funds are limited, and the new earl is a stingy guardian who will not loosen the purse strings to allow her to properly maintain herself and her sisters in their new home. The only way to save them all is for her to marry.

Lady Emmaline Fitzhugh, a hopeless romantic, is tired of sitting with the wallflowers, waiting for her betrothed to come to his senses and marry her. When Emmaline reads one too many reports of his scandalous liaisons in the gossip rags, she takes matters into her own hands.

She's an unconventional lady who has traveled the world, practices the art of self-defense most excellently, and has an interesting tattoo in—ahem—a very unusual place. He's a former member of the Metropolitan Police, now a private investigator, who grew up on the poverty-ridden streets of Edinburgh and has worked the dangerous back alleys of London's notorious East End. A vicious murder brings them together in a race against time that takes them from the sordid back streets of London into the elite private clubs of the powerful and rich.

Trevor Hunt, the Duke of Ridgely, has been called many things, most of which are true. Reviled by his family, hated by many, he's earned his reputation in the seedy streets of London and more than his fair share of bedchambers. But battling deadly foes and irate husbands failed to prepare the duke for the most troublesome role he's played yet: guardian to one maddening hoyden.