Maybe 'Halloween's Dark Secret' would be a good one. It makes you curious about what the secret could be in the context of Halloween.
The Haunted House on Hallow's Eve.
Halloween's Ghostly Gala.
It could be 'The Secret Adventure' if it's a story about an exciting and hidden journey.
It depends on the main theme or the key event of the story. For example, if it's a romance, something like 'Love's Journey' could work.
Well, a good title could be 'Adventures in a Forgotten World' if it's a fantasy story. Or 'The Heart's Hidden Desires' for a drama. Titles that evoke curiosity or set the mood are often effective.
How about 'The Hidden World of Autism'? It gives a sense of the unique and often misunderstood world that those with autism experience.
'Adventure in the Lost Realm'. The word 'lost' immediately creates a feeling of intrigue. It makes the reader wonder what this realm is, how it was lost, and what kind of adventures await the characters there. It could be a lost city, a forgotten dimension, or an ancient land full of secrets.
Revenge: A Dish Best Served Cold.
The Magic of Christmas Eve. It gives a sense of mystery and wonder associated with Christmas. Christmas Eve is often a time of anticipation and magic, and this title can capture the essence of that special night in a Christmas story.
I think 'The Broken Heart's Journey' could be a good one. It gives a sense of a painful and difficult path.