The Forty Rules of Love (Sorok Pravil Lyubvi)

Love is the water of life. Lovers are the fire of the soul. The entire universe begins to spin differently when fire falls in love with water.
13th century. In the small town of Konya, a town where the Crusaders did not reach from the west after the sack of Constantinople and where the hordes of Genghis Khan did not roll from the east, 'a few true believers' hire an assassin nicknamed Jackal's Head to eliminate Shams Tabrizi, a wandering dervish preaching 'the forty rules of the religion of love.' After all, the more a person talks about love, the more he is hated.
Present day. USA. Ella Rubinstein, working at a literary agency, receives a manuscript for review, 'Sweet Blasphemy,' set in the 13th century. Ella is so captivated by the novel that she begins to suspect that the author was somehow inspired by the novel's hero, Shams of Tabriz. And then love for the author of the book bursts into her heart, completely turning her familiar and so dear life upside down.