The iconic duo find themselves swiftly drawn into a series of puzzling and sinister events: an otherworldly stone whose touch inflicts fatal bleeding; a hellish potion to unlock a person’s devilish psyche; a fiendishly clever, almost undetectable method of revenge and many more—including a brand-new Cthulhu Casebooks story.

From the Supernatural Case Files of Sherlock Holmes London's most beloved detective encounters his most deadly foe, and the results will be unlike any Sherlock Holmes adventure before it!

It is the autumn of 1880, and Dr. John Watson has just returned from Afghanistan. Badly injured and desperate to forget a nightmarish expedition that left him doubting his sanity, Watson is close to destitution when he meets the extraordinary Sherlock Holmes, who is investigating a series of deaths in the Shadwell district of London. Several bodies have been found, the victims appearing to have starved to death over the course of several weeks, and yet they were reported alive and well mere days before.

From the brilliant pen of Agatha Christie comes two novels featuring the beloved sleuthing duo: In the The Secret Adversary, Tommy and Tuppence decide to embark on a daring business scheme: Young Adventurers Ltd. But they get more than they bargained for when their first assignment for the sinister Mr. Whittington draws them into a diabolical conspiracy. Set during the dark days of World War II, Agatha Christie’s N or M? puts two most unlikely espionage agents, Tommy and Tuppence Beresford, on the trail of a pair of Nazi spies who have murdered Britain’s top agent.

Three critically acclaimed recordings are joined together in this dazzling Agatha Christie Triple Bill, read by award-winning narrators Alison Larkin and James Warwick, star of the Partners in Crime TV series on Masterpiece Theater.

The year 1894. The monstrous Hound of the Baskervilles has been dead for five years, along with its no less monstrous owner, the naturalist Jack Stapleton. Sir Henry Baskerville is living contentedly at Baskerville Hall with his new wife, Audrey, and their three-year-old son, Harry. Until, that is, Audrey’s lifeless body is found on the moors, drained of blood. It would appear some fiendish creature is once more at large on Dartmoor and has, like its predecessor, targeted the unfortunate Baskerville family.

Internationally best-selling author Lyndsay Faye became enamored with tales of Sherlock Holmes and his esteemed biographer, Dr. John Watson, as a child and later began spinning these quintessential characters into her own works of fiction - from her acclaimed debut novel, Dust and Shadow, which pitted the famous detective against Jack the Ripper, to a series of short stories for the Strand Magazine, whose predecessor published the very first Sherlock Holmes short story in 1891.

It is fall. CIA analyst Jack Ryan, historian and former Marine, is vacationing in London with his wife and young daughter. Suddenly, right before his eyes, a terrorist group launches its deadly attack. Instinctively, he dives forward to break it up, and is shot. It is not until he wakes up in the hospital that he learns whose lives he has saved - the Duke and Duchess of Kent.

Three linked crimes test Sherlock Holmes’ deductive powers, and his skepticism about the supernatural, to the limit.

January 1888: Dr. John H. Watson has returned to 221b Baker Street, just weeks after a personal tragedy has left him bereaved and bereft. Feeling like a broken man, his plans and dreams lying in ruin, he slowly tries to make his way forward, with the help of Sherlock Holmes and Mrs. Hudson. Unexpectedly, he finds himself standing in the path of a madman—who suddenly and irrationally blames Watson for his apparent defeat.

His code name was “The Needle.” He was a German aristocrat of extraordinary intelligence - a master spy with a legacy of violence in his blood, and the object of the most desperate manhunt in history.... But his fate lay in the hands of a young and vulnerable English woman, whose loyalty, if swayed, would assure his freedom - and win the war for the Nazis....

A series of grisly murders rocks London. At each location, only a jumble of bones remains of the deceased, along with a bizarre sphere covered in strange symbols. The son of the latest victim seeks the help of Sherlock Holmes and his former partner, Dr. John Watson. They discover the common thread tying together the murders. Bizarre geometries, based on ancient schematics, enable otherworldly creatures to enter our dimension, seeking to wreak havoc and destruction.

Kurt Austin and his crew are back to slake their thirst for action as they attempt to drown an eco-extortionist's plan to control the world's freshwater supply. From deep within the Venezuelan rain forest emanates the legend of a white goddess and a mysterious tribe with startling technical accomplishments. Few believe the tribe exists, and even fewer suspect its deity can change the course of history.

A dying millionaire hires private eye Philip Marlowe to handle the blackmailer of one of his two troublesome daughters, and Marlowe finds himself involved with more than extortion. Kidnapping, pornography, seduction, and murder are just a few of the complications he gets caught up in.

In the 1980s and 1990s, the late Terry Golledge wrote 10 Holmes masterful pastiches that perfectly captured Dr. Watson's voice, as well as Holmes’ personality and methods. Mr. Golledge passed away in 1996, before these stories could be published. In early 2022, Terry’s son, Niel Golledge, reached out to Sherlockian editor David Marcum, who was electrified to read such wonderful previously lost tales about the heroes of Baker Street.