Based on the characterizations originally created by Dashiell Hammett, the story emerges as a neatly-fashioned whodunit. Richard Thorpe paces the plot nicely, overcoming, before too long, the hurdles of a rather slow opening.Production as a whole, however, lacks much of the sophistication and smartness which characterized the early Thin Man films. Deficiency is mainly in the dialog and other business provided for the two leads. Yarn deals with an espionage ring working for a foreign power. Involves a battle of wits to secure a group of paintings which leads to a couple of killings. Myrna Loy, while graceful and piquant for the most part, photographs unattractively in a number of sequences.