The story of Mayor Abdul Razek al-Sharshabi (Omar al-Sharif) when his younger son, Tawfiq (Khalid al-Nabawi) is called for army recruitment, his wife (Safiya al-Omari), rejects it, suggesting to send someone else to go instead. So the Mayor persuaded a poor father named Abdul-Muqeem (Izzat al-Alayli) to send his only son Masrey instead.
More info
