Books like The Unnatural Inquirer (Nightside, Book 8) by Simon R. Green

Gavin Guile, the powerful Prism who governs as high priest and emperor, must complete five impossible goals in five years while concealing a son’s existence that threatens the fragile peace of his world.

James Stark survives a decade in Hell, only to return to Los Angeles where angels and demons clash as he seeks revenge, redemption, and perhaps love in this irreverent supernatural thriller.

A supernatural mystery in the Nightside of London where private eye John Taylor hunts the Unholy Grail, stirring secret magic and ancient conspiracies.

John Taylor, a London private investigator, faces an unexpected succession when the powerful Nightside agent Walker dies, leaving a dangerous legacy of enemies and hidden baggage that threatens to unravel his world.

Private investigator John Taylor wields the legendary sword Excalibur while navigating London’s secret Nightside, guided by the Last Defenders of Camelot, a fearsome knightly order.

Chelsea Clark’s sudden disappearance on a girls’ night out pulls her husband—prime suspect—into a desperate search when he hires private investigator Morgan Dane to clear his name and find his missing wife.

Meet Tommy Akhtar, Ugandan Asian cricket fan, devoted son, and not very successful private investigator with offices over his brother Gundappa's mini-cab firm in deepest West London.He's just woken up from his hangover (combing the parting on his toungue) when his next case comes through the door. It looks like just another investigation when hooker Melody comes into his office asking him to find her co-worker, Natasha, last seen meeting new client at a bar in Shepherd's Market.But as the search for Natasha intensifies, Tommy's world becomes increasingly sinister. He is drawn into a murder investigation, the criminal underworld, the world of fundamentalist religion and maybe even terrorist activities. Neate brilliantly explores the oddball underbelly and wierd cultural mix of London - The City of Tiny Lights - today and questions just what it really means to be British now.....

When a physics expert and a rare‑book dealer both vanish from the eccentric Inglewood Turrets in North London, private‑investigator Albert Campion is drawn into a baffling mystery of disappearance.

Taylor, a former Nightside child with sanity intact, leaves the shadows to work in sunlit London, hunting lost items—and occasionally, lost people—while traces of his past linger.