The basic elements of documentary are taken from the events in the story (Nicols, 26-35). The historical facts are narrated such that there are often flash backs to the events as a connection develops to a past event. There is greater degree of dramatic license given minor details where history does not offer any details. The elements of a drama documentary are:

Depiction of real life historical events

The emphasis on known facts of the event and prevailing perceptions

Flashing the facts using literary and narrative techniques to tell the story

The drama esthetics is maintained by discussing minor historical facts and conspiracies

The "Who killed Dr. Bogle and Mrs. Chandle" documentary does not use dramatic license very often to maintain drama more than the story. Rather it maintains the series of facts to come to a conclusive point and thus makes effective progress towards solving the decade's long mystery...
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