Here are some ideas, categorized for easier browsing:
Intriguing & Evocative:
* The Obsidian Mirror
* Whispers in the Willow
* The Silent House on the Hill
* Crimson Tide Conspiracy
* The Serpent's Kiss
* Shadow of the Spire
* The Raven's Curse
* Seven Deadly Secrets
* The Clockwork Heart
* The Gilded Cage
Direct & Action-Oriented:
* The Vanishing Act
* The Midnight Killer
* Case Closed (or Case Unclosed)
* The Last Witness
* Deadly Deception
* Pursuit of Justice
* The Code Breaker
* Blood on the Snow
* The Hunt for Red October (inspired, of course)
* The Stolen Legacy
Location-Specific (adapt to your story):
* The Secrets of Blackwood Manor
* Death in the Deep Woods
* The Ghosts of Grimsborough
* The Cairo Caper
* The Parisian Enigma
* The London Labyrinth
* The Tokyo Treachery
* The Dublin Deception
Character-Focused (adapt to your protagonist):
* Isabella's Inheritance
* The Detective's Dilemma
* Silas's Shadow
* Anya's Accusation
* The Professor's Puzzle
* The Reclusive's Revenge
Playing with Words/Alliteration:
* Silent Shadows
* Crimson Clues
* Deadly Dreams
* Twisted Truths
* Fatal Fortune
* Grim Gamble
Tips for Choosing a Title:
* Keep it concise: Aim for a title that's memorable and easy to say.
* Reflect the genre: The title should hint at the mystery genre without giving away too much.
* Target your audience: Consider who you're writing for and what kind of title would appeal to them.
* Test it out: Get feedback from others on potential titles.
Remember to check if your chosen title is already in use before settling on it. Good luck!