Beirut in 1982 lies in rubble after weeks of siege, its streets and apartment blocks reduced to broken concrete and twisted rebar. The film opens on this wreckage, once a city nicknamed 'the Paris of the Middle East,' and follows the investigation into what caused so much of it. Professor Lamb, a US investigator, examines allegations that Israel used American-supplied cluster bombs against the city in violation of arms agreements, tracing unexploded munitions and interviewing witnesses to the bombing campaign. The footage moves through hospitals treating the wounded, streets cleared of debris, and officials pressed on the legality of the weapons used. The film sits inside the wider argument over the Lebanese civil war and Israel's invasion, but keeps its focus narrow: what these specific bombs did to a specific city, and whether the agreements meant to prevent their use were broken. It plays as a piece of on-the-ground wartime reporting rather than a broad historical overview.