"Trifles" is a play with a unified plot. Although there are verbal flashbacks to the events of the day of the murder of John Wright, the entire play's plot begins and ends in a span of one day. The author also extends the unified plot to create a single setting (the farmhouse kitchen). The plot centers on John Wright's murder. Mrs. Wright is the main suspect; an investigation is taking place as to the motive or reason for the crime.

The Sheriff, Mr. Hale and the County Attorney are introduced first to the audience. They are investigating the crime scene. The women, Mrs. Hale and Mrs. Peters, accompany the men to gather whatever of Mrs. Wright's belongings that she needs in jail. This exposition turns ironic when the women end up "investigating" and actually come up with evidence, while the professional men leave without an answer to their...