Two years later, following a move to London, March finished his third novel, "The Tallons", the second in his "Pearl County" series. Reviews in the UK were generally positive, more so than in the United States. Psychological problems that had already bothered him in Germany worsened in London, and he became a patient of psychoanalyst Edward Glover, who was able to cure March's throat paralysis, diagnosing it as a hysterical condition. (March dedicated "The Tallons" to him, "as a slight recompense for the gray hairs I have put in his head".) While in London March became acquainted with a number of literary characters, leaving more of his Waterman work to his subordinates. In 1937, he returned to the US and within two years resigned his position to concentrate more on his writing, which by then was a full-time occupation; he had been paid partly in stock and could live well off the dividends. 1937, Simmonds notes, was an important year: it marked the high point of his productivity as a short-story writer, and the magazine "The American Mercury" took up "Company K" for a reprinting. In 1943, he completed his most ambitious and critically acclaimed novel, "The Looking-Glass", the final book in his "Pearl County" series; Bert Hitchcock, literature professor at Auburn, called it March's "finest literary achievement".