The dictionary definitions of suspense include:

uncertainty: the state or condition of being unsure or in doubt about something

enjoyable tension: a feeling of tense excitement about how something such as a mystery novel or movie will end

anxiety: a state of anxiety or intense worry about something

Let’s examine ways that a writer can evoke these feeling to her audience.
Here are some ways to create suspense:

• You need a good plot.  Take the time to map out exactly what you have in your head.  I find that an outline is extremely helpful.

• Set the scene and mood to draw the reader into the story.  This might take a lot of description.

• Use believable characters.  If your reader can relate to your character, especially the main character, s/he will be more likely to feel a connection with the story.  This connection will pull them into the scene and allow them to feel the tension that you will later create. 

• Don’t give your reader all the information at once.  Slowly feed them the story.  Give them a chance to look forward to what will happen next. 

• Show what your characters are doing.  My rule is to describe the scene and setting but show the characters movements and emotions. 

• Use suspenseful words and phrases as you build to the climax.

Creating a suspenseful story is the trait of a skilled writer. It takes lots of practice.  It took me a while to figure out the points listed above.  I’m still practicing so give it time.