After crashing behind Qatar National Library, an alien navigator named Orjuan attempts to repair his ship by extracting Arabic letters from reality, as advised by his AI, Fateen. He accidentally erases the language from existence, one character at a time, by absorbing it through the Old Tongue Book. At the National Library, two young friends, Harf, a logic-driven inventor, and Esem, a passionate artist, discover the threat as books go blank and voices begin mumbling around them. The duo must unite their opposing talents in a high-stakes confrontation to stop Orjuan from absorbing the final, critical letter, Ḍād (ض), the anchor of the Arabic language. Ultimately, Harf and Esem save their language not by destroying the alien Orjuan, but by turning a destructive theft into a bridge of understanding.