The Mad Miss Manton

At 3:00 am, Melsa takes her dogs for a walk near a subway construction site. She sees Ronnie Belden run from a house and drive away, leading her to the Lane property. Inside, she discovers George Lane's dead body and a diamond brooch tucked in her cloak. Her cloak slips off the brooch, and by the time the police arrive, the body, cloak, and brooch have disappeared.

The police arrive to find the body, cloak, and brooch missing, leaving no clear trail of what happened. Lieutenant Mike Brent declines to launch a full investigation, labeling it another prank by Melsa and her friends. Peter Ames publishes an editorial condemning the prank culture, and Melsa sues him for libel.

To defend their reputation, Melsa and her cohort resolve to find the murderer themselves. They launch a practical manhunt that sweeps through the Lane house, Belden's apartment, Lane's office, and all the town's beauty shops. The effort marks a shift from gossip to a deliberate search for the truth.

As they press on with the investigation, two separate attempts are made to intimidate Melsa into backing off. The threats come from unknown adversaries who want to derail the search for the killer. The women stay undeterred and continue their pursuit of clues.

Melsa survives two assassination attempts, one occurring at a charity ball and another as part of a trap designed to use her as bait. The danger surrounding the case escalates as the killer tries harder to silence her. Her courage sustains the group through the escalating peril.

The women confront Peter Ames directly, attacking him twice and tying him up in the process. Myra Frost even flirts with him during one of these encounters, adding a provocative twist to the tense investigation. The dynamic between the investigators and Ames grows more complex as the case unfolds.

Frances Glesk, now Sheila Lane's ex-husband Edward Norris's girlfriend, approaches with an alibi claiming she and Eddie were at a hockey game during the murders. She argues that Eddie's ten-minute smoke break at intermission couldn't have placed him at the scene. The claim adds a competing timeline to the investigation.

Melsa deduces that Ronnie Belden removed the body and cloak from the Lane house before the police arrived. This insight helps explain why the initial crime scene appeared hollow to investigators. The realization shifts suspicion toward those connected with Belden and Norris.

An escaping would-be killer leaves behind a piece of tar paper, bringing to mind the subway construction site. Melsa recognizes the clue as a hint linking the killer to the earlier location. The revelation narrows the field of suspects and drives the investigation forward.

Returning to the construction site, Melsa finds a fast electric cart on the track that explains how Norris could reach the crime scene in ten minutes. This crucial detail ties Norris's movements to the murders. The evidence consolidates the theory that Norris orchestrated the events.

Edward Norris is captured after confessing to the murders and briefly holding Melsa and Peter hostage at gunpoint. The confession provides the murder weapon and motive, resolving several of the case's lingering questions. His confrontation with the duo marks a turning point in the investigation.

Following Norris's confession, the police rescue Melsa and Peter from danger. The tense standoff ends with Norris's capture and the immediate threat neutralized. The immediate crisis subsides, allowing the couple to reassess their precarious situation.

Amid the danger and revelations, the relationship between Melsa and Peter evolves from hostility to love. Peter openly decides he intends to marry her and begins to court her with renewed vigor. The alliance solidifies as they navigate the aftermath of the case together.

With the case resolved and the threat gone, Melsa and Peter commit to a future together. They become engaged, and the couple starts planning their honeymoon. The film closes on a note of domestic happiness following a perilous investigation.