This documentary history chronicles what in duration and volatile intensity was the most important love relationship in H.L. Mencken's life, one that he tried to obscure and hoped would remain buried within the copious record of his achievements as author and editor. The love between Marion Bloom and Mencken flourished during a period when he wrote frequently about women's issues.

In Defense of Marion both illuminates Mencken's ambivalent attitudes toward the "New Woman" and presents a particularized social history of the intellectual and personal aspirations of many women during the early twentieth century.

Bloom and Mencken met in 1914 and became lovers within a few months. Their intimacy continued, on and off, until about a year before Mencken's marriage to Sara Haardt in 1930. Edward A. Martin, who supplies a wealth of interpretive notes and commentary, tells of the Mencken-Bloom affair not only through selections from their letters and diaries but also through excerpts from the personal writings of others who were close to the two and who often complicated their relationship.

Such relevant figures include Sara Haardt; Estelle Bloom, Marion's sister; Theodore Dreiser, Estelle's lover and employer as an editorial assistant; and the movie star Aileen Pringle, with whom Mencken was infatuated.