If you loved watching Alex Stern police Yale’s occult societies for Lethe—tracking illicit rituals at Skull and Bones and getting dragged into Tara Hutchins’s murder—then you’ll click with Myfanwy Thomas waking up amid the Checquy, a covert British agency that bureaucratizes the supernatural. Like Alex, Myfanwy has to master a hidden world fast while dodging conspiracies and monsters, and her case files and memos echo the procedural, behind-the-curtain vibe you enjoyed in Ninth House.

If the gruesome side of Lethe’s work—grisly crime scenes, dangerous rites, the Grays that only Alex can see—hooked you, The Library at Mount Char pushes that darkness further. Carolyn and her "siblings" were raised by a godlike "Father" to master horrifying catalogs of power; their rituals have the same bone-deep menace as Lethe’s most forbidden practices. It’s brutal, secretive, and full of terrible knowledge kept behind polite doors—very much the energy of Alex’s encounters with New Haven’s nastiest magic.

If Alex’s willingness to flout Lethe protocol—working the Grays to get answers, lying to Dean Sandow, doing what it takes to survive—was your favorite part of Ninth House, you’ll devour Vicious. Victor Vale and Eli Ever engineer superhuman abilities through near-death experiments, then spiral into a razor-edged rivalry. Victor’s cool, calculated rule-breaking and the ethical murk around their powers mirror Alex’s pragmatic, do-what-works approach.

If what grabbed you was how Lethe audits rituals, files incident reports, and traces the procedural fallout of Tara Hutchins’s death through Yale’s houses, Three Parts Dead gives that same institutional texture. Tara Abernathy and her mentor Elayne Kevarian practice necromantic contract law—litigating with gods, parsing binding clauses, and reconstructing forbidden workings. The way magic meshes with governance and paperwork will scratch the same itch as Lethe’s rule-bound oversight.

If you liked how Ninth House cross-cut Alex’s "Before" and "After" the New Haven murder—slowly unveiling what happened to Darlington and who killed Tara—American Gods uses a similarly layered approach. Shadow’s road trip with Mr. Wednesday is punctuated by mythic interludes and sideways reveals, piecing together a bigger, stranger conflict only after you’ve lived inside its mysteries.