How is Faber described in the novel, The Eye of the Needle?

Follett could easily have depicted Faber as a flat, malicious killer, but as Time reviewer, Michael Wood notes, "Follett has given him a personality that sets him apart from spies that typically populate thrillers." For unlike the usual spy, who is indifferently callous toward his victims, Faber has a nagging conscience, which causes him to vomit after every murder he commits. By adding this sympathetic side to Faber's character, Follett endears him to the reader, and Faber therefore dies a martyr instead of a rogue. As Wood so aptly concludes concerning Follett's characters, "they seem to linger in the memory long after the circumstances blur."