Betting on Zero is a well-done if not stylistically distinctive nonfiction effort that nonetheless proves fascinating due to its subject matter.

Mr. Ackman comes across as sincere in his outrage and cogent in his presentations. Even more valuable is the opportunity to meet and learn about Herbalife's purported victims, from Queens to Chicago to Oklahoma.

It all adds up to a timely, provocative and absorbing tale of money, power and a search for the truth.

This outstanding documentary, reminiscent of the investigative journalistic style of Going Clear and Citizenfour, is an absolute must-see.