Chabon is a spectacular writer. He does a witty turn reinventing Yiddish for the modern Alaskan Jews - of course the lingua franca of Jews without an Israel - just a little of which I, with only faintly remembered childhood Yiddish, could grasp. A mobile phone is a shoyfer (perhaps because, like the ram's horn, it calls you), a gun is a sholem (a Yiddish version of a Peacemaker?). Chabon is a language magician, turning everything into something else just for the delight of playing tricks with words. He takes the wry, underbelly vision of the ordinary that the best of noir fiction offers and ratchets it up to the limit. Nothing is allowed to be itself; all people and events are observed as an echo of something else. Voices are like "an onion rolling in a bucket", or rusty forks falling. An approaching motorcycle is "a heavy wrench clanging against a cold cement floor. The flatulence of a burst balloon streaking across the living room and knocking over a lamp." Chabon's ornate prose makes Chandler's fruity observations of the world look quite plain. Nothing is described as just the way it is. Nothing is let be. He writes like a dream and has you laughing out loud, applauding the fun he has with language and the way he takes the task of a writer and runs delighted rings around it.

For the most part, Chabon's writing serves the knotted mystery that is being unravelled, but there is eventually a point where it begins to weary the mind, where the elaborations of things get in the way of the things themselves and the narrative gets sucked under by style. The compulsory paragraph of Byzantine physical description whenever another character arrives on the scene starts to seem an irritating interlude; another over-reaching cadenza. Though it seems churlish to complain about such a vivid talent, a little less would have been enough already.

It’s obvious that the creation of this strange, vibrant, unreal world is Chabon’s idea of heaven. He seems happy here, almost giddy, high on the imaginative freedom that has always been the most cherished value in his fiction.

Some of the pleasures of The Yiddish Policemen’s Union are, actually, distinctly Dan Brown–ish. Mr. Chabon often ends chapters with cliffhangers that might be tiresome in the hands of a lesser writer (say, Dan Brown). Here, they’re over-the-top suspenseful, savory and delicious.

More important, Mr. Chabon has so thoroughly conjured the fictional world of Sitka — its history, culture, geography, its incestuous and byzantine political and sectarian divisions — that the reader comes to take its existence for granted. By the end of the book, we feel we know this chilly piece of northern real estate, where Yiddish is the language of choice, the same way we feel we have come to know Meyer Landsman — this “secular policeman” who has learned to sail “double-hulled against tragedy,” ever wary of “the hairline fissures, the little freaks of torque” that can topple a boat in the shallows.

This novel makes you think, but it is an ordeal to read. The problem: Chabon has mixed two very dark story lines that jar the reader. There is the real tragedy of Sitka's wandering Jews, and then there is the faux bleakness of the noir genre with its posturing attitude. The central character comes across as a Jewish Humphrey Bogart wannabe, not a three-dimensional character who can shoulder a 400-plus-page novel about exile, fanatics and longing.