Suspense is apprehension about what is going to happen, it can also an uncertain cognitive state; "the matter remained in suspense for several years."
It's the excited anticipation of an approaching climax; "the play kept the audience in suspense."
Suspense is a feeling of uncertainty and anxiety about the outcome of certain actions, most often referring to an audience's perceptions in a dramatic work. Suspense is not exclusive to fiction, though. Suspense may operate in any situation where there is a lead up to a big event or dramatic moment, with tension being a primary emotion felt as part of the situation.