<B>A penetrating and ambitious historical novel, <I>Havoc, in Its Third Year</I> is an ingenious, often deeply unnerving narrative of seventeenth-century England that speaks directly to the fanaticism and fears of today.</B> <BR> The time is the early seventeenth century, as the quarrel between Royalists and Parliamentarians turns toward civil war, and that between Catholics and Protestants leads toward bloody religious tyranny; the place is a town in northern England, set in a grim landscape swept by crop failures, plague and rumors of war, in which rigid Puritans have taken over government and imposed their own rules. <BR> At the center of the novel is John Brigge, the Coroner and a Governor of the town, though not by any means as convinced a zealot as his fellow governors have become. Married and deeply in love with Elizabeth, who is pregnant with their first child, he has a guilty secret to hide in his affection for Dorcas, his wife's ward -- a secret which, in the world of