Winner of the Edgar Award! Finalist for the Agatha Award and Anthony Award! Twelve-year-old Myrtle Hardcastle has a passion for justice and a Highly Unconventional obsession with criminal science. Armed with her father’s law books and her mum’s microscope, Myrtle studies toxicology, keeps abreast of the latest developments in crime scene analysis, and Observes her neighbors in the quiet village of Swinburne, England. When her next-door neighbor, a wealthy spinster and eccentric breeder of rare flowers, dies under Mysterious Circumstances, Myrtle seizes her chance. With her unflappable governess, Miss Ada Judson, by her side, Myrtle takes it upon herself to prove Miss Wodehouse was murdered and find the killer, even if nobody else believes her—not even her father, the town prosecutor.

Before the train has left the station, England’s most accomplished new detective already is on a suspect’s trail. Myrtle Hardcastle has no desire to go on a relaxing travel excursion with her aunt Helena when there are More Important things to be done at home, like keeping close tabs on criminals and murder trials. Unfortunately, she has no say in the matter. So off Myrtle goes—with her governess, Miss Judson, and cat, Peony, in tow—on a fabulous private railway coach headed for the English seaside. Myrtle is thrilled to make the acquaintance of Mrs. Bloom, a professional insurance investigator aboard to protect the priceless Northern Lights tiara. But before the train reaches its destination, both the tiara and Mrs. Bloom vanish. When Myrtle arrives, she and Peony discover a dead body in the baggage car. Someone has been murdered—with Aunt Helena’s sewing shears. The trip is derailed, the local police are inept, and Scotland Yard is in no rush to arrive. What’s a smart, bored Young Lady of Quality stranded in a washed-up carnival town to do but follow the evidence to find out which of her fellow travelers is a thief and a murderer?

Finalist for the 2022 Edgar Allan Poe Award, the Agatha Christie Award, and the Anthony Boucher Award! Myrtle Hardcastle—twelve-year-old Young Lady of Quality and Victorian amateur detective—is back on the case, solving a string of bizarre murders in her hometown of Swinburne and picking up right where she left off in Premeditated Myrtle and How to Get Away with Myrtle. When the proprietor of Leighton’s Mercantile is found dead on the morning his annual Christmas shop display is to be unveiled, it’s clear a killer had revenge in mind. But who would want to kill the local dry-goods merchant? Perhaps someone who remembers the mysterious scandal that destroyed his career as a professor and archaeologist. When the killer strikes again, each time manipulating the figures in the display to foretell the crime, Myrtle finds herself racing to uncover the long-buried facts of a cold case—and the motivations of a modern murderer.

Finalist for the 2023 Agatha Christie Award! Myrtle Hardcastle—twelve-year-old Victorian Amateur Detective—returns to investigate the case of a missing heiress lost at sea, an inquiry that runs aground when a murder in plain sight has no apparent victim. When a mysterious girl attempts to stake her claim to the Snowcroft family fortune, Myrtle Hardcastle’s father, a lawyer, is asked to help prove—or disprove—the girl’s identity. Is this truly Ethel Snowcroft, believed to be lost at sea with her parents, or a con artist chasing a windfall? Mr. Hardcastle’s pursuit of the case takes a detour when he’s hospitalized for a tonsillectomy—only to witness a murder. Or does he? With no body at the scene, Myrtle and her governess, Miss Judson, fear the so-called murder was a feverish delusion—until a critical piece of evidence appears. But where’s the victim? And who at the hospital could be harboring murderous intent? Myrtle is determined to find out before the killer comes after her father. With stakes this high, her sleuthing has put Myrtle, her family, and the patients and staff at the Royal Swinburne Hospital In Myrtle Peril.

In the fifth book of the Edgar Award-winning series, Myrtle Hardcastle uncovers a string of murders during a treasure hunt on a haunted Scottish estate. When her governess inherits an estate on a Scottish island, amateur detective Myrtle Hardcastle couldn't be more excited. Unfortunately, the ancestral castle is both run-down and haunted. Ghostly moans echo in the walls, and there are rumors of a cursed treasure lost on the island—an ancient silver brooch that may have cost the former lord his life. But who had the motive, means, and opportunity to kill him? And could this Scottish trip mean the end of Myrtle's plans to get her father and governess together? Then Myrtle's investigation stirs a villain out of hiding. The estate’s boat is stolen, so there’s no escape from the island. Myrtle is forced to play a deadly game, hunting for the brooch with a thief breathing down her neck—someone who will stop at nothing to get the treasure, even if it means murder.