If you loved how Tony Gillingham pieces together the Red House shooting—reconstructing the timeline with Bill, probing the office’s hidden access, and sifting real clues from red herrings—you’ll relish how Joseph Rouletabille tackles an “impossible” attack behind a bolted door in The Mystery of the Yellow Room. Like Tony’s cool-headed reasoning against Inspector Birch’s official line, Rouletabille methodically tests alibis, measurements, and movements around the château corridor until the “impossible” becomes inevitable.

Enjoyed Tony and Bill’s breezy, tongue‑in‑cheek banter while they poke into the Red House office, compare footprints, and cheerfully outpace the police? Gervase Fen and poet Richard Cadogan bring that same buoyant wit to Oxford in The Moving Toyshop, chasing a corpse that seems to vanish along with the entire shop. The wisecracks come fast, but the clueing is real—much like Tony’s playful “rehearsal” of the crime that still lands the solution squarely on fair evidence.

If the growing camaraderie between Tony Gillingham and Bill Beverley—staking out corridors, testing alibis, and sharing eureka moments—was your favorite part, The Hound of the Baskervilles gives you that dynamic in spades. Holmes and Watson split duties on the moor much as Tony delegates to Bill at the Red House, swapping observations and theories until the pattern of footprints, sightings, and rumors resolves into fact.

Drawn to the intimate country‑house circle around Mark and Robert Ablett—servants, guests, and villagers—where Tony combs rooms, gardens, and that suspicious office for small but telling clues? In The Murder at the Vicarage, Miss Marple dissects a single village’s gossip, alibis, and household routines after Colonel Protheroe is shot. Like the Red House inquiry, the setting is close‑knit, the suspect list tight, and every tiny inconsistency matters.

If the late‑stage reveals in the Red House case—hidden routes, swapped identities, and the way Tony’s experiment reinterprets earlier clues—delighted you, The Murder of Roger Ackroyd is the gold standard. Poirot’s village investigation is packed with planted details that seem harmless until the end snaps them into a new configuration, delivering that same clean, fair surprise without breaking the rules.