Ginny Beauchamp joins the Women's Land Army in 1940. Posted to Essex, she gets in trouble for meeting pilots from a nearby airfield, including Piotr, a Polish airman to whom she feels some attraction, being part-Polish herself.

Sent to work on a farm with a final warning, she finds herself in the middle of an emotional storm because another Land Girl, Anna, has fallen in love with the farmer's son.

In August after the Luftwaffe attack the airfield at North Weald Ginny discovers that Piotr has been seriously wounded, and she rushes to the hospital. When she returns to the farm late at night, she discovers the dead body of Anna in the yard beneath the barn's winching point. Ginny believes that Anna's death is suspicious, and she cannot accept that Anna fell or committed suicide, which is the view of the local police and coroner.

Ginny is on her own in trying to reveal the truth of Anna's death. For her challenge to the authorities over the death, Ginny is dismissed from service.

Now on her own, she risks her own life to try to reveal the truth.