The confession traces Robert's gradual decline into despair and madness, as his doubts about the righteousness of his cause are counteracted by Gil-Martin's increasing domination over his life. Finally, Robert loses control over his own identity and even loses track of time. During these lost weeks and months, it is suggested that Gil-Martin assumes Robert's appearance to commit further crimes. However, there are also suggestions in the text, that 'Gil-Martin' is a figment of Robert's imagination, and is simply an aspect of his own personality: as, for example when 'the sinner' writes, 'I feel as if I were the same person' (as Gil-Martin).