hen the lives of Mahmoud, a Muslim Sheikh (Omar Sharif) and Boulos, a Christian Theologian (Adel Imam) are threatened by religious extremists on both sides, the Egyptian government inducts them into a witness protection program that requires them to disguise themselves as the Christian Marcus and a Muslim Sheikh, Hassan el-Attar, respectively. When, unwittingly, they move into the same building, a friendship blossoms that must, along with a romance between the protagonists' children, withstand the difficulties of prejudice and social persecution.

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