Plot Outline: A cab driver finds himself the hostage of an engaging contract killer as he makes his rounds from hit to hit during one night in LA. He must find a way to save both himself and one last victim.

Thanks, I understand what it means. Then the proper translation should be "Соучастник поневоле" or something like it.

the whole movie is about a guy and his accomplice... well... there you go !
No, a driver isn't his accomplice! He's a hostage.