Prophet: Dragon Chaser

When Jason Prophet is hired by his best friend to guard a hauntingly beautiful woman from Japan, he not only falls in love, he finds his best friend murdered. After the woman disappears, Prophet swings into action, following a trail of drug smugglers that leads to Japan.
Soon he's in the Land of the Rising Sun where he's unable to speak the language and mystified by its customs. All the evidence points him toward the sinister world of the Yakuza, the infamous Japanese mafia. Up against guns and samurai swords, with only his wits and his dogged determination to save him, Prophet closes in, determined to save the woman he loves and revenge his friend's death. But neither event turns out as he expects.