The story of Mark Felt, who under the name "Deep Throat" helped journalists Bob Woodward and Carl Bernstein uncover the Watergate scandal in 1974.Wikipedia
Mark Felt Reviews
It also doesn't help that the colour palette is consistently dark and gloomy; meant to add some sense of dread it ends up crossing the fine line into being dreary. There's absolutely no problem with slow, measured and deliberate pacing, but when the runtime of an hour and forty-five minutes feels long-drawn, there's a problem with engaging your audience. The result is the textbook definition of a missed opportunity.
Good intentions, terrible direction...