When Tatyana Morozova, a pre-school teacher in Milwaukee, Wisconsin, learned that her mother had been killed and her old apartment block destroyed by an explosion back in Moscow, she believed the official version: that the attack was the work of Chechen terrorists. Then an American scholar published a book arguing that the bombing was engineered by the FSB, the Russian secret service, to help Vladimir Putin win the elections.

Torn by grief and disbelief, Tatyana and her sister Alyona embark on a journey in space and time to seek the truth - followed by the camera of Russian filmmaker Andrei Nekrasov. Filmed in Milwaukee, Moscow, Denver, Washington, London and the Ural Mountains, Disbelief chronicles the agony of a devastated family swept up in the high-stakes politics of global terrorism.