Moon Rider, by Victor Ostrovsky

Moon Riders walk a thin line between right and wrong. They have no boundaries whatsoever because the mission they’ve been assigned is so critical that legalities are not a concern. The ends will justify the means. There’s great danger in moon riding, both to you and others. If you break into a building and unexpectedly encounter a night watchman, for instance, you kill him. There’s too much at stake to worry about rules. Ostrovsky’s Moon Rider stays at water’s edge, ready to turn either way depending on how the operation progresses. Moon riders are always on the edge of right and wrong.