The Mystery at Lilac Inn is the fourth Nancy Drew novel, first published in 1930, and continues the series' early exploration of deception, identity and quiet authority. When a valuable set of jewels disappears from a fashionable country inn, suspicion spreads quickly among guests and staff alike. What appears to be a straightforward theft soon reveals layers of misdirection, false assumptions and carefully concealed motives. Nancy Drew approaches the case with her characteristic composure, observing patterns others overlook and questioning conclusions reached too easily. As she follows the trail of evidence, the investigation exposes how appearances can be manipulated and how trust can be deliberately misplaced. This edition presents the original 1930 text, accompanied by a contemporary foreword and structured summary notes designed to support clarity while preserving the integrity of the narrative. The Mystery at Lilac Inn reinforces Nancy Drew's role as a confident, self-directed investigator whose authority rests on judgment rather than position.