Milgrim can disappear in almost any setting, and his Russian is perfectly idiomatic — so much so that he spoke it with his therapist in the secret Swiss clinic where Bigend paid for him to be cured of his addiction.
Garreth doesn't owe Bigend a thing. But he does have friends from whom he can call in the kinds of favours powerful people need when things go sideways.
They all have something Bigend wants as he finds himself outmaneuvered and adrift, after a Department of Defense contract for combat-wear turns out to be the gateway drug for arms dealers so shadowy they can out-Bigend Bigend himself. (From Berkley)