Sussex, 1881. Lady Helena Scott-De Quincy's marriage to Sir Justin Whitcombe, three years before, gave new purpose to a life almost destroyed by the death of Lady Helena's first love. After all, shouldn't the preoccupations of a wife and hostess be sufficient to fulfill any aristocratic female's dreams? Such a shame their union wasn't blessed by children...but Lady Helena is content with her quiet country life until Sir Justin is found dead in the river overlooked by their grand baroque mansion.

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.

1929: Miss Clara Vale is a woman ahead of her time. Rather than attending Oxford to bag an eligible Duke (as her mother, Lady Vale, so desperately hoped), she threw herself into a degree in chemistry, with aspirations to become a scientist in her own right. But the world isn't ready for Clara. Unable to land a job in science because she's a woman, she is stuck behind the desk at a dingy London library. Until her estranged Uncle dies suddenly, leaving her his private detective agency, and laboratory, in his will.

Tabitha, Lady Chesterton, the Countess of Pembroke, is newly widowed at only 22 years of age. With no son to inherit the title, it falls to a dashing, distant cousin of her husband's, Jeremy Chesterton, known as Wolf. It quickly becomes apparent that Wolf had consorted with some of London's most dangerous citizens before inheriting the title. Can he leave this world behind, or will shadowy figures from his past follow him into his new aristocratic life in Mayfair? And can Tabitha avoid being caught up in Wolf's dubious activities?

Lady Violet Belmaine emerges from two years of mourning less than enthusiastic about resuming her place in Polite Society. She’s talked into attending a country house party by her French physician friend, Hugh St. Sevier, only to find that the house party guests are preyed upon by a mysterious thief.