Here are some good and unused book titles, categorized by genre:
Mystery/Thriller:
* The Whispering Walls
* The Shadow Weaver
* The Lost City of Secrets
* The Silence of the Grave
* Nightfall on Elm Street
* The Clockwork Killer
* The Serpent's Kiss
* The Red Thread
* The Last Witness
* The Vanishing Act
Romance:
* The Lavender Moon
* Beneath the Tuscan Sun
* Whispers of the Heart
* A Second Chance at Love
* The Butterfly Effect
* Moonlight on the Sea
* The Secret Garden of Dreams
* A Love Story in Bloom
* The Unexpected Proposal
* The Accidental Love Affair
Sci-Fi/Fantasy:
* The Starborn
* The Whispers of the Ancients
* The Shadowlands
* The Dragon's Breath
* The Gatekeeper's Curse
* The Time Traveler's Dilemma
* The Alien Within
* The Forbidden Prophecy
* The City of Dreams
* The Last Sentinel
Historical Fiction:
* The Ghost of the Palace
* The Lost Letters of Vienna
* Echoes of the Revolution
* The Weaver of Time
* The Secret of the Emerald Ring
* The Shadow of the Empire
* The Last King's Legacy
* The Forgotten War
* The Hidden City
* The Dance of the Dragons
Contemporary Fiction:
* The Weight of Words
* The Art of Letting Go
* The Broken Compass
* The Unexpected Journey
* The Light Within
* The Last Summer
* The Family Secret
* The Second Act
* The Unwritten Chapter
* The Accidental Hero
Remember, a good title:
* Is intriguing and memorable.
* Relates to the story's themes or plot.
* Is appropriate for the target audience.
* Doesn't sound too generic or cliché.
Bonus Tip: Test out your title with a few potential readers and see if it sparks their interest!