Cleaner (1970)

Radical activists take over an energy company’s annual gala at the Shard – the tallest skyscraper in Western Europe – seizing 300 hostages in order to expose the corruption of the hosts. Their just cause is hijacked by a zealous extremist within their ranks, who is ready to murder everyone in the building to send his anarchic message to the world. It falls to an ex-soldier turned window cleaner, Joey Locke – suspended 90 storeys up on the outside of the building – to save those trapped inside and take down the killers, whilst also finding a way to bring the corrupt energy moguls to justice.