Lisa, Stella, and Jeff stand at the window and summarize what they know.
Jeff notices some interesting changes to the garden where the dog had been digging: a flower that's not the same size as it was the day before.
He thinks of a way to move things along and writes a note to Thorwald: "What have you done to her?"
Lisa anonymously slides the note under Thorwald's door.
Thorwald picks up the note and goes out to find who left it; Lisa manages to run out before he sees her.
Stella notices Miss Lonelyhearts preparing to take a dangerously large amount of sleeping pills, but Lisa redirects their attention to Thorwald and his wife's handbag.
Stella and Lisa decide to go digging in the garden.
Jeff places a call to Thorwald, asking him to meet him at a local bar or else. This gets Thorwald out of the apartment, giving the women some time to explore.
Lisa suddenly decides to climb the fire escape to search the apartment.
Stella and Jeff, watching from the window, call the police when they see Miss Lonelyhearts getting ready to swallow the pills.
Suddenly, Thorwald returns to his apartment. Lisa is trapped while Jeff and Stella helplessly watch him attack her. Jeff quickly calls the police to report a man assaulting a woman next door, but it's not looking good for Lisa.
The police arrive (nick of time, etc.), and Lisa talks her way out, wiggling her finger with Mrs. Thorwald's wedding band at Jeff to indicate that she has the evidence.
Thorwald notices and looks up to see Jeff and Stella watching him.
The police take Lisa to jail, which is just fine with her.
Stella leaves to bail Lisa out of jail, while Jeff calls Doyle to update him on everything.
The phone rings, and Jeff initially thinks it's Doyle.
It's not. It's Thorwald.
Thorwald slowly climbs the stairs to Jeff's apartment.
Jeff sits defenseless in his chair, so he grabs the tools of his trade—his camera and a bunch of bulbs.
Thorwald looks weary and miserable. He wants to know what they want from him—money? Why are they doing this? We almost feel sorry for him. Almost.
Jeff uses his camera flashbulb as a weapon to disorient Thorwald as he menacingly approaches.
Lisa and Doyle are just downstairs, and Jeff shouts to them as Thorwald leaps across the room to grab him.
Thorwald tosses Jeff out the window, but the approaching cops break his fall.
The cavalry is here, and Thorwald confesses. The dog had found the severed head in the garden, so Thorwald moved it to a hatbox in the apartment. No one's interested in seeing it.