 In the very beginning the plot of the movie closely follows details of the independent investigation of the 1999 Russian apartment bombings described in the book "" by Yury Felshtinsky and Alexander Litvinenko, representing them as parts of the plan masterminded and sponsored by exiled tycoon Pokrovsky (obvious hint at Boris Berezovsky in real life) and aimed to discredit Russian security services.As this plan has failed, Pokrovsky assisted by some terrorists organizes a hostage taking in a Moscow circus (very similar to Moscow theater hostage crisis in real life) in order to return to Russia, acting as a saver of the hostages during negotiations.However, he fails to do so.