Airgraph: woman writing letter to son in air force, picture on desk, mailing letter. Women sorting through letters, feeding same into microfilm copyer and handing roll on microfilm to another woman. Shot of stack of letters with roll of microfilm side by side for comparison. Comparison of one frame of microfilm on full-size letter. Cut to Liberator bomber in flight seen from another aircraft. PAN of Cairo and cut to Egyptian girl re-copying microfilm onto readable format. Shots of British soldiers receiving and reading mail. Dissolve to British tanks advancing in desert, soldiers on foot behind them, explosions in sand.