Before the film, several text cards explain bombers and the Royal Air Force chain of command. The film begins with an observation aircraft flying over and dropping a box of undeveloped film. Bomber Command develops the film and analyzes the resulting photographs, which are presented for the audience to see. There has been a massive build-up by German forces in the subject area for the past few months. The film shows the planning of the mission, even detailing how the bomber wing chooses munitions for the task. The weather forecast is expected to be good, and the pilots are briefed. The crew of F for Freddie, the bomber that is the focal point of the film, suits up and takes off. While over Germany, the crew bombs the target, dead on for one bomb, but is hit by flak from faceless anti-aircraft gunners. The radio operator is hit in the leg. Freddie is the last aircraft to return. There is mist covering the water, prompting worry at the Command. Meanwhile, Freddie cannot climb after the flak hit. They are not losing altitude, but are in a bad situation. Tension builds in the film until finally, F for Freddie lands. No aircraft are lost and the mission is a complete success.