Definitions of suspense: RESEARCH

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 commonly seen in thriller movies, making the audience feel uneasy and on edge as suspense is built up to a specific outcome. 

Famous director, Alfred Hitchcock is known for being the 'master of suspense'. Hitchcock knew that the suspense is generated when the audience can see danger his characters cannot see, or can only suspect.