Caged. Death World, #2

With no memory of who he is, private investigator James Ray wakes up in Russia. Kidnapped by the Yakuza, he's been turned into a pawn in a global conspiracy. With only his instincts and a loyal dog by his side James must navigate a brutal underworld to reclaim his life. Meanwhile, his girlfriend Tara, a former elite operative, is held captive by Ryu Murakami: a Yakuza mastermind with ambitions that stretch across continents.
Trapped in a web of trafficking and arms deals, she's forced into a psychological battle that will test the limits of her strength and training. As James fights to survive and Tara plans her escape, danger closes in. From backroom deals in Tokyo to violent standoffs in Moscow, a coded tattoo known only as "108" holds the key to unraveling a sinister empire of crime. A relentless, adrenaline-fueled thriller, CAGED is the second book in the Death World series by Lee Pletzers.