If the 1983-London magic-under-the-cobblestones of The Left-Handed Booksellers of London hooked you—the clandestine bookish guild, Merlin’s dandy duels, and Susan stumbling into a hidden bureaucracy that wrangles Old World beings—you’ll love the Folly. In Rivers of London, probationary constable Peter Grant is recruited into a tiny unit of the Met that investigates supernatural crimes, negotiating with river gods and interrogating ghosts. It’s the same vibe of clever banter and brisk chases through real London streets, with the procedural chops you enjoyed when Susan, Merlin, and Vivien pieced together clues from archives and occult turf.

Did you enjoy watching Susan, Merlin, and Vivien follow grim little leads from bookshops to safe houses, juggling catalogues, sigils, and sudden monster attacks? The Atrocity Archives aims that same investigative energy at cosmic horror. IT guy–turned–field agent Bob Howard works for a very secret British agency that treats magic like hazardous math—and audits it accordingly. The casework, the dry humor, and the mad dashes to contain breaches will feel familiar to anyone who loved the booksellers’ methodical clue-hunting and last-minute interventions in Nix’s London.

If Merlin’s flamboyant flair, the booksellers’ wry asides, and the cheeky tone during hair-raising fights were your catnip, meet Bartimaeus. This snark-slinging djinni narrates much of The Amulet of Samarkand with razor wit as he’s summoned by ambitious apprentice Nathaniel. You’ll get that same blend of laugh-out-loud commentary and dangerous magical politicking you saw when Merlin dusted a crime boss with a pin and then quipped his way through chaos—only now from a delightfully sardonic, centuries-old spirit who’s seen it all.

Susan’s search for her father—and the revelation of what she is—parallels Myfanwy Thomas waking up in a London park with no memory and letters from her former self. In The Rook, Myfanwy must slot back into the Checquy, a covert agency of the preternaturally gifted, while untangling who tried to destroy her. If you loved how Susan navigates bookseller ranks, uncovers family truths, and claims her place beside Merlin and Vivien, you’ll relish Myfanwy’s clever, often funny reclamation of identity amid conspiracies and monstrous showdowns.

Nix’s hidden Old World—those uncanny entities the booksellers catalog and occasionally sword-fight—echoes the mythic undercurrent in The Dark Is Rising. Will Stanton discovers he’s one of the Old Ones and is drawn into a timeless struggle of Light and Dark across wintry English villages. If the way Merlin and Vivien treat legends as living facts—and the way Susan keeps tripping over beings out of British lore—enchanted you, this classic delivers that same eerie, numinous collision of folklore and the present day.