The Vanishing at Midnight. This title gives a sense of mystery as 'vanishing' implies something disappearing suddenly and 'midnight' is often associated with the unknown and spooky things.
A great title is 'The Unseen Threat'. It makes the reader immediately start to wonder what this threat could be. Since it's 'unseen', it could be anything from a supernatural entity to a hidden human danger, which creates a lot of suspense.
One could be 'The Vanishing at Midnight'. It gives a sense of mystery as the word 'vanishing' implies something disappearing without a trace and'midnight' is often associated with the unknown and things that go bump in the night.
Beneath the Surface. It's short and simple but makes you wonder what lies beneath. Is it a hidden truth? A dark secret? It gives a feeling that there's more than meets the eye.
'Broken Hearts and Shattered Dreams: A Breakup'. This title clearly shows the emotional turmoil of a breakup with the mention of broken hearts and shattered dreams.
Some good titles could be 'The Mysterious Key', 'The Lost City', 'The Enchanted Forest'. These titles are engaging as they immediately create a sense of mystery and adventure. For example, 'The Mysterious Key' makes the reader wonder what the key is for, where it was found, and what secrets it might unlock. 'The Lost City' gives the impression of a place full of forgotten stories and hidden treasures. And 'The Enchanted Forest' brings to mind a magical place with strange creatures and unearthly beauty.
'The Hidden Vampire'. It creates curiosity as readers would want to know why the vampire is hidden. Is it to protect itself? Or is it hiding from something even more powerful?