When heiress Ethel Moulton is shot dead at the altar moments after becoming Mrs. Stanford Bingham, the wedding guests are left in shock. No one heard the shot, no one saw the killer, and the bride's priceless diamond vanishes from her neck. With hundreds of witnesses yet no useful testimony, detective Alan Ford faces an impossible case. The groom had reason to want his freedom, the bride's cousin stood to inherit her fortune, and a mysterious woman was seen fleeing the scene.
As Ford investigates cryptic musical messages and uncovers secrets from the victim's past, he realizes the murderer planned this crime with diabolical precision. The trail leads through rejected suitors, hidden marriages, and a deadly deception that only the most cunning detective work can unravel.