Jack the Ripper begins his reign of terror. Miss Sarah Bain, a photographer, supplements her meager income by taking illicit boudoir photographs of the town's local ladies of the night. But when two of her models are found gruesomely murdered within weeks of one another, Sarah begins to suspect it's more than mere coincidence.

Hours later, the man’s cold body lies in the city mortuary, alongside the woman he couldn’t save. And his sister, unconventional nurse Gemma Tate, tracks down troubled police inspector Sebastian Bell to unravel the truth. Sebastian has enough pressure to solve the murder of an aristocratic heiress without Gemma meddling in his case. But the cryptic sentences she brings him from her brother’s notebook could be a crucial lead. If only they knew what “milky way” meant.

As a chill sets in on New York City in the winter of 1888, a jewel thief dubbed the Robin Hood of the Lower East Side has been stealing from the city's wealthiest and giving to the poor. Genevieve Stewart - a young woman whose family is part of Mrs. Astor's famed 400 but who has forged a life of her own as a reporter - decides to chase the story, but gets more than she bargained for: a murder victim sprawled in a dark alley in the dangerous Five Points neighborhood.

This seemed like a cut-and-dried case of suicide to Detective Sergeant Kathleen Doyle; the decedent—a wealthy theatre patron—must have decided that life without her famous husband was too hard to bear, and so she’d ended it. Indeed, nothing about the tranquil scene would indicate foul play, save for the housekeeper’s insistence that something was amiss.

After a routine delivery, midwife Sarah Brandt visits her patient in a rooming house and finds that another boarder, a young girl, has been killed. At the request of sergeant Frank Malloy, she searches the girl's room and discovers that the victim is from one of the most prominent families in New York - and the sister of an old friend. The powerful family, fearful of scandal, refuses to permit an investigation. But with Malloy's help, Sarah begins a dangerous quest to bring the killer to justice before death claims another victim.

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.

When the body of a young man is found stuffed into the tomb of a medieval knight, Parish Constable Daniel Haze is tasked with investigating his first solo murder case. Suspicion instantly falls on the only stranger to arrive in the village of Birch Hill just before the crime took place, but the American captain proves to be an unexpected asset. A former soldier and a skilled surgeon, Jason Redmond is not only willing to assist Haze with the investigation but will risk his own safety to apprehend the killer.

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?

Determined to find the men responsible for her disgraced father's murder, Lady Arianna Hadley disguises herself as a man and contrives to be hired as a chef in one of London's aristocratic households. But when the prince regent is poisoned by Arianna's special chocolate dessert, she finds her own quest has become intertwined with a far more deadly intrigue. The earl of Saybrook is asked by the government to investigate. When someone tries to kill them both, they become reluctant allies in the hunt to discover what evil is afoot.

Anglemore Park is the ancestral home of Lady Emily Hargreave's husband Colin. But the stately calm of country life is destroyed when their neighbor, the Marquess of Montagu, bursts through the French doors from the garden and falls down dead in front of the shocked gathering. But who has a motive for murdering the young aristocrat? The lovely cousin who was threatened by his engagement, the Oxford friend he falsely accused of cheating, the scheming vicar's daughter he shamelessly seduced or the relative no one knew existed who appears to claim the Montagu title?