CHRISTIE, Agatha. Parker Pyne Investigates. London: Collins, 1934. 8o. Original cloth (slight lean, spine faded with light spotting). FIRST EDITION. -- Mr. Parker Pyne. Detective. New York: Dodd, Mead & Company, 1934. 8o. Original cloth; pictorial dust jacket (portions of spine lacking, 1 in. of front panel corner torn away). FIRST AMERICAN EDITION. Together 2 volumes, both first editions of Christie's only collection of Parker Pyne short stories, the "heart detective" whose advert read, "Are you happy? If not, consult Mr. Parker Pyne..." (2)