Radically as Dr. Cronin's new novel ["Three Loves"] differs in plot and episode from "Hatter's Castle," so indelibly does this author impress his personality on his work that one will recognize the same hand behind both. Nor is this all, for in one particular is there similarity. In the first of the two books it is a man's stubbornness, an uprightness that leans backward, that eventually accomplishes his ruin. In "Three Loves" it is a woman's stubbornness. Here, however, the analogy ends. In "Hatter's Castle" James Brodie breaks most of the lives about him, and his own defeat is unrelieved by anything that could be called a victory. Lucy Moore, on the other hand, although she brings sufficient pain to others, and a major portion of pain to herself, does to no one irreparable injury; and there is something of victory in her own ultimate defeat. "Three Loves...