Monologues can be an effective approach to novels (Tabucchi, Hrabel,Tuck and Kolitz come to mind). However, to be effective the reader needs to be sympathetic/empathetic to the speaker or the problem. Unfortunately, for the first two-thirds of this novel Samuel Perlman was a bitter, uninteresting character. However, the last third places Perlman's isolation/desolation into a broader existential, Jewish, Kabbalistic context. Finally, his issues become issues of humanity - how to create a life, a persona to stave off desolation.
The author provides a very consistent voice and a dry humor that makes the novel an enjoyable read.