Northamptonshire, 1810: As a new canal network snakes across the landscape, a vicious mob stakes its claim to the county. Every local constable is out on the hunt for the ruthless Panther Gang. When an elderly man is robbed and murdered in sleepy Middleton, the beleaguered magistrates send for help from London's Bow Street Police Office.

Northumberland, 1809: A beautiful young heiress disappears from her locked bedchamber at Linn Hagh. The local constables are baffled and the townsfolk cry "witchcraft". The heiress' uncle summons help from Detective Lavender and his assistant, Constable Woods, who face one of their most challenging cases.

London, 1812: Treacherous gangs roam the capital, and not even the Palace of Westminster is safe. When Detective Stephen Lavender is called in to investigate a highway robbery and a cold-blooded murder, both the cases take a dangerous and disturbing personal twist.

London, 1812. At a fashionable address in leafy Mayfair, a far cry from Detective Stephen Lavender’s usual haunts, a man is found dead in his room. He has been brutally stabbed, but the door is locked from the inside, and the weapon is missing. The deceased is David MacAdam, an Essex businessman with expensive tastes. As Lavender and Constable Ned Woods travel between London and Chelmsford seeking to understand MacAdam’s final hours and unearth the grisly truth, they uncover a tangled web of deceit behind his stylish facade.

When Lady Cordelia, a brilliant mathematician, and her brother, Lord Woodbridge, disappear from London, rumors swirl concerning fraudulent bank loans and a secret consortium engaged in an illicit - and highly profitable - trading scheme that threatens the entire British economy. The incriminating evidence mounts, but for Charlotte and Wrexford, it's a question of loyalty and friendship. And so they begin a new investigation to clear the siblings' names, uncover their whereabouts, and unravel the truth behind the whispers.

When the beautiful daughter of Sir Basil Moidore is stabbed to death in her bed, Inspector Monk and Nurse Latterly uncover a tale of shame and scandal that threatens to destroy a powerful London dynasty.

The Earl of Wrexford possesses a brilliant scientific mind, but boredom and pride lead him to reckless behavior. He does not suffer fools gladly. So when pompous, pious Reverend Josiah Holworthy publicly condemns him for debauchery, Wrexford unsheathes his rapier-sharp wit and strikes back. As their war of words escalates, London's most popular satirical cartoonist, A. J. Quill, skewers them both.

Inspector Treadles, Charlotte Holmes’ friend and collaborator, has been found locked in a room with two dead men, both of whom worked with his wife at the great manufacturing enterprise she has recently inherited. Rumors fly. Had Inspector Treadles killed the men because they had opposed his wife’s initiatives at every turn? Had he killed in a fit of jealous rage because he suspected Mrs. Treadles of harboring deeper feelings for one of the men? To make matters worse, he refuses to speak on his own behalf, despite the overwhelming evidence against him. 

Let the wicked be ashamed, and let them be silent in the grave. These ominous words, slashed from the pages of a book of Psalms, are the last threat that the darling of London society, Sir Edward Grey, receives from his killer. Before he can show them to Nicholas Brisbane, the private inquiry agent he has retained for his protection, Sir Edward collapses and dies at his London home, in the presence of his wife, Julia, and a roomful of dinner guests.

A tragic accident leaves Inspector Monk with amnesia just moments after he solves the murder of a popular Crimean war hero. Forced to redo his entire investigation, a frustrated Monk faces a desperate murderer who will do anything to keep the inspector from discovering the truth twice.

Partners now in marriage and in trade, Lady Julia and Nicholas Brisbane have finally returned from abroad to set up housekeeping in London. But merging their respective collections of gadgets, pets, and servants leaves little room for the harried newlyweds themselves, let alone Brisbane's private enquiry business. Among the more unlikely clients: Julia's very proper brother, Lord Bellmont, who swears Brisbane to secrecy about his case.

Lady Julia Grey travels through India, accompanied by her sister, Portia, her brother, Plum, and occasionally her husband - Brisbane. Along the way, Portia becomes convinced of a murder, and all four are pulled into the dark underbelly of 19th-century India....

Following the death of her husband, Lady Darby has taken refuge at her sister's estate, finding solace in her passion for painting. But when one of the house guests is murdered, her brother-in-law asks her to aid the insufferable Sebastian Gage - a fellow guest with some experience as an inquiry agent. While Gage is clearly more competent than she first assumed, Kiera isn't about to let her guard down, as accusations and rumors swirl.

In Grimsgrave Hall, enigmatic Nicholas Brisbane has inherited a ruined estate, replete with uncanny tenants and one unwanted houseguest: Lady Julia Grey. Despite his admonitions to stay away, Lady Julia arrives in Yorkshire to find Brisbane as remote and maddeningly attractive as ever. Cloistered together, they share the moldering house with the proud but impoverished remnants of an ancient family: the sort that keeps their bloodline pure and their secrets close.

Returning to her childhood home, Lady Kiera Darby hopes her beloved brother Trevor and the merriment of the Hogmanay Ball will distract her. But when a caretaker is murdered and a grave is disturbed at nearby Dryburgh Abbey, Kiera is once more thrust into the cold grasp of death. While Kiera knows that aiding in another inquiry will only further tarnish her reputation, her knowledge of anatomy could make the difference in solving the case.