Enigma

An enigma is usually where something is suggested to the audience but it is not fully explained. It can also be a question that is not immediately answered and is left a mystery until the reveal what is usually at the end of the film. For example we may see something at the start of the film, like someone throwing a briefcase into the river. The enigma here is us not knowing the identity og the person and we do not know the contents of the briefcase. We suggest to ourselves that it could be drugs, money or a bomb. These are the most typical  ideas yet it could be anything.