Master of the Hashomi by Jeffrey Lord

The provided excerpts from Master of the Hashomi, Book 27 of the Richard Blade Series, detail the protagonist, Richard Blade's, latest transition into Dimension X for a secret British project led by Lord Leighton and J. Upon arrival, Blade, a veteran secret agent, finds himself embroiled with the highly disciplined, drug-using warrior order known as the Hashomi, whose base is the Valley of the Hashomi and who are led by a powerful Master. The narrative describes Blade's capture, recovery in the Hashomi hospital, alliance with discontented women like Mirna, and subsequent escape as he makes his way to the large city of Dahaura, where the Hashomi plan a deadly internal attack with local criminals like the Thieves Guild and the Fighters of Junah against the ruler, the Baran of Dahaura. Blade is quickly recruited into the Baran's service as a Demad, forming an alliance with figures like Kubin Ben Sarif and the courtesan Esseta (whom he later marries), ultimately leading the counter-offensive that destroys the Hashomi leadership in Dahaura and culminates in a final military campaign where Blade and the Baran's forces defeat the Hashomi in their valley.