M R James kept well away from the hurly-burly of the chaise-longue; towards the end of his life, he observed that writers of horror stories were beginning to "drag in sex, which is a fatal mistake; sex is tiresome enough in the novels; in a ghost story, or as the backbone of a ghost story, I have no patience with it". However, although "The Green Man" includes probably as much how's-your-father as any Amis novel, it is a worthy successor to the James tradition.
Maurice Allington, like most Amis heroes, is an intellectual snob, has a drink problem, and finds monogamy a severe challenge. So far par for the course. However, even by Amis standards this novel gets alarmingly close to his own situation at the time:
-Allington is coming to a crisis point in his marriage to his second wife ("Joyce"/ Elizabeth Jane Howard)
-He has difficulty connecting to his teenage daughter ("Amy"/the tragic Sally Amis)
-The only person who is his intellectual equal and who, while loving him, can put him in his place is his son ("Nick"/Martin Amis)
Thus Allington's mid-life crisis closely mirrors Amis' own malaise. The "struggling young academic" theme of the first four novels is left far behind, and Allington is faced with very strong intimations of mortality. The novel is a major step towards the ageing self-doubt of "Jake's Thing" and "Stanley and the Women".
Allington runs a country inn (it would now be called, to Amis' disgust, a gastropub) which has a well-documented ghost. Hitherto this has meant little more to him than a selling point to credulous guests, but the ghost gradually moves into Allington's life, ultimately offering him a Faustian pact. At first the ghost has an easy job, as the manifestations it creates are similar to the effects of the delirium tremens which Allington either already has experienced or is about to (it's not quite clear which). However, Allington grows into a worthy adversary for his spectral nemesis.
One of the amazon.com reviewers interprets the novel as a parody of another James - Henry, in "Turn of the Screw" (which I didn't finish - it didn't grab me, mea culpa). Scandalously, there are 13 reviews of "The Green Man" on amazon.com, but prior to mine only one on amazon.co.uk. A prophet in his own country ...
As always in Amis, there is humour, but it is less gratuitous and much darker than usual. The only real comic character is a 1960s "swinging vicar", and even here the vicar's trendiness is relevant to his part in the story.
Ghost stories often include an appearance of a saint, a good angel etc, but I can't think of many where a personification of God Himself appears. (This often happens in film, but not in literature.) This is a very difficult literary device to pull off, and Amis' success shows his skill. He even contrives to get God to discuss how accurately he (God) was portrayed by Milton.
As usual, Amis has several gratuitous axes to grind, including (surprisingly) attributing to Allington a hate of the "puny and piffling art" of novelists.