In my view, Wiilaim Peter Blatty’s novel Legion is at least as confused as his Exorcist III film, which is based on Legion-(cum-rewrite).
For example, the Legion novel contains page after page filled with extended internal dialogue of police detective William Kinderman about theology, evolution, crime, evil, and various problems of life – and they slow the narrative flow to a crawl. Kinderman’s theological speculations are show-stoppers. Too much time is devoted to them, they slow down the action, and worse, the author uses them as best he can to coerce the reader into embracing an uncritical Creationist/ID position. Kinderman is revealed to be – despite his nice words about science – a closet Creationist-mystic, as well as a type of heretical quasi-Gnostic.
The Gnostic material actually does work rather well, as it dovetails somewhat with Fr. Lankester Merrin’s earlier speculations in the Exorcist novel, and it serves as a resilient springboard for Blatty’s cosmic speculations about “the Angel”; the Gemini Twins (reified in the novel as James and Thomas Vennamun); and even the “Gnostic” theme of the divine twins (the God who permits a co-eternal divine “companion” to take on a new, personal destiny in the form of the cosmos/ matter/Satan/the Angel; the intense, depressed, dying Dr. Vincent Amfortas and his wisecracking Doppelganger, and even Fr. Joe Dyer with his semi-legendary “brother Eddy”.
But the Creationist/ID material is just bombastic and embarrassing, at least to anyone who is normatively or even nominally familiar with biology, physics, and evolutionary theory. In Christian philosophy, “Evolution” as well as “Creation” must be seen to derive from the same Divine source – but from what we now know about the world, it seems obvious that evolution would in this Christian view, be seen as the material means by which “the Creator” chose to develop – to “create” – life on Earth. Thus, Kinderman’s theology is, sadly – because it opts for the pre-scientific view – stuck at a level of childish, pre-critical Creationist/ID naivete – except for the few occasions when he waxes blissful about evolutionary mystic priest Teilhard de Chardin (who formed an important basis for Blatty’s Merrin character).
Moreover, Legion seems to me to be a book written in a hurry, containing frustrating loose ends and plot quirks, for example: now, in an inexplicably updated history, Kinderman and Karras had been “best friends”; the language lab technician from the original story who discovered Regan’s “backward English” has now become a black female, etc.).
And there is a puzzlingly disturbing bit where Dr. Amfortas’ Doppelganger tells the dying doctor that the (lost by death) love of Amfortas’ life, “Annie”, had carried on an affair with the book’s worst human villain, the malicious Dr. Temple…thus dealing the mostly sympathetic Amfortas a huge psychic wound within hours of his death – an authorial cruelty crafted for no understandable reason at all.
Another inconsistency: Kinderman accuses Dr. Temple of deliberately hypnotising and otherwise psychologically interfering with James Vennamun – it turns out that Temple was the chief medical officer investigating Vennamun’s decades-old original crime spree, with Blatty weirdly casting Temple, years later, as a possible information-feeder to the mysterious “Patient X” (who really is James Vennamun/the Gemini Killer), which creates the bizarre effect of casting Temple as a culprit who implanted the idea of being the Gemini Killer in the patient’s mind. This is an unnecessary distraction, and it corrodes Blatty’s main point that Vennamun/the Gemini is the real serial killer, placed by the vengeful demon into Karras’ resuscitated body to create a “scandal” by which the body of the saintly priest will continue the Gemini’s murder sprees. But of course, it is a given that the vengeful demon and the Gemini Killer do not need any oustside, suggestive help from Dr. Temple or anyone else – so to suggest such a thing may indeed have transpired – particularly so close to the story’s climax – casts doubt on Blatty’s main thesis that the vengeful demon has been the sole source of using Vennamun’s soul-in-Karras’-body to exact revenge on Karras’ old friends. Why on earth would Blatty cast this – or any – doubt in the reader’s mind (a doubt, which if true, risks invalidating the novel’s narrative flow and its very meaning) – and this so close to the story’s end?
Finally, at the graveside where Karras’ body is being re-interred, Kinderman says “goodbye to the man who might have been Damien Karras“. What a blatantly inept thing to write! Why? Because Blatty has already established via the Gemini’s dialogue that Damien Karras – consistent with the first novel’s and film’s ending – has gone on to his reward. Only his resuscitated body is present, as a vehicle for the Gemini (with the vengeful demon of course lurking close by behind the scenes). DAMIEN KARRAS – AS KARRAS, AS THE SOUL OF KARRAS – is long gone away to Heaven. Only the reaminated shell remains, as a vehicle of incarnaton for the Gemini.
Hence, there is no room whatsoever for the notion that the re-interred corpse “might” have been Karras. It was never Karras – the body did not hold Karras’ soul – not after Karras’ original, real death in The Exorcist and later in the Legion’s takeover by the Gemini. The demon-manipulated Vennamun/the Gemini is the only occupant of Karras’ reanimated body (the studio rewrite would destroy and radically alter this original dynamic).
From Vennamun’s own explanations, Kinderman, by the time he is standing by Karras’ grave, should have known that the recently dead body (dead for the second time) was only a reanimated shell that contained only Vennamun, not Karras; and Blatty, by insinuating some doubt about the matter both for Kinderman and for the reader – again, within just a few pages of story’s end, after the climax – seems to have committed a really irresponsible, goofy – and even disrespectful – gaffe. There can be no doubt that the re-buried corpse, although it was Karras’ body in the story, ever held Karras’ soul, which had already passed on to its heavenly reward. The body was not animated by Damien Karras during the Georgetown crime spree and Kinderman’s involvement therein: the body was animated only by Vennamun/the Gemini Killer, with the vengeful demon from the original story pulling the strings.
And so… this long-winded post has attempted to justify why I think Legion’s pages and pages of Creationist speculation are scientifically embarrassing, as well as too lengthy and preachy; and why I think that the other listed flaws may perhaps derive from Blatty apparently writing the book in far too much of a hurry.