Al Layla al-thalitha wal-'ishrun (The 23rd Night)

In the final volume of the Sani' al-dhalam series, Youssef continues his perilous journey, now tasked with hunting down a mysterious, ancient entity known only as 'the Thing'. This malevolent force has existed since the dawn of time and is preparing to unleash the darkest period in human history. As Youssef closes in, he discovers the Thing is aware of his pursuit, setting the stage for an ultimate confrontation on the fated Twenty-third Night.