Charlie Chan at the Wax Museum

Charlie Chan was lured there under the pretense of a radio broadcast debate with Dr. Otto Von Brom about the Rocke case. In reality, it was a trap orchestrated by Dr. Cream and the criminal conspiracy to get revenge on Chan for testified against McBirney. The broadcast was a setup designed to place Chan in a deadly trap while the criminals controlled the situation behind the scenes.

Earlier, McBirney's escape from custody set the stage for the trap, as he fled directly to the wax museum hideout run by Dr. Cream.

Dr. Cream rigged Charlie Chan's chair with wiring designed to electrocute him during the broadcast reenactment. However, Von Brom insisted on changing seats with Chan at the last moment. When watchman Willie Fern was tricked into throwing the switch, it was Von Brom who died, but not from electricity. The real method of murder was a bamboo blowgun dart, not the electrocution setup.

The small detail of Von Brom changing seats was emphasized during the setup, making his death appear accidental.

The killer was Dagan, known as 'The Butcher,' who used a bamboo blowgun dart to puncture Von Brom's neck. Chan discovered the small puncture wound and the dart at the crime scene. The murder was made to look like an electrocution accident during the blackout, but it was actually a concealed assassination using a quiet weapon.

Chan noticed the clues at the scene pointed away from electricity toward a more intimate murder method.

McBirney was convicted of murder and sentenced to death based on Charlie Chan's testimony. He escaped custody seeking revenge against Chan and found refuge at the wax museum, which was secretly a Mob hideout run by Dr. Cream. There, Cream performed plastic surgery to alter McBirney's appearance, helping him hide among the crowd and avoid recognition as part of the larger conspiracy.

The opening scene established McBirney's death sentence and his escape, setting the revenge plot in motion.

Dagan, nicknamed 'The Butcher,' was the actual murderer who framed Joe Rocke for his crimes. Chan became convinced that Rocke was innocent and that the entire trial was based on false testimony. Dagan later killed Von Brom to keep him quiet and eliminate anyone who could expose the frame. The conspiracy used the wax museum as a base to manipulate alibis and rearrange identities.

During the broadcast, Chan's suspicion grew that Rocke was innocent and the case was a setup.

Dr. Cream had previously performed plastic surgery on Dagan, altering his facial features to obscure his identity. This surgical alteration allowed Dagan to blend in with the crowd at the wax museum without being recognized, even as Chan investigated the crimes. The wax museum setting provided the perfect cover for this disguise, as it was already filled with altered wax figures and was a front for criminal activity.

Cream's work on McBirney's face demonstrated his ability to change people's appearances for the conspiracy.

Jimmy Chan, Charlie Chan's son, sneaked into the wax museum to investigate the situation without his father's knowledge. He moved through the shadows gathering information about the conspiracy. His presence added a personal stake to the investigation, as Chan now had to protect his son while unraveling the criminal plot.

Jimmy's unauthorized entry created additional tension and danger for the Chan family.

Lily Latimer was Dr. Cream's assistant at the wax museum. During the blackout, she secretly cut the electrocution wiring to keep another secret hidden from the investigation. Her actions ensured the electrocution trap wouldn't work as intended, though she was not the one who killed Von Brom. She was covering her own involvement in the criminal operation.

Lily's role remained hidden until Chan investigated the actual murder method at the scene.

During the reenactment for the radio broadcast, Von Brom insisted on changing seats with Charlie Chan. This seemingly small detail became crucial when the lights went out and the electrocution trap was activated. Instead of Chan being killed, Von Brom ended up in the fatal position, though the actual death came from Dagan's blowgun dart, not the electricity.

The seat change was noted as a significant moment that altered the chain of events.

Chan identified Dagan by connecting the evidence: the blowgun dart pointed to a concealed murder method, and the puncture wound indicated someone among the crowd. Chan realized that Dagan was 'The Butcher' who had framed Rocke and killed Von Brom. The key was uncovering how Dagan's identity was hidden through Cream's plastic surgery, allowing him to move freely among the suspects despite being the wanted criminal.

The investigation narrowed the field to suspects who could access the murder weapon while hiding their true identity.

The wax museum served as the perfect front for the criminal conspiracy. Run by Dr. Cream, a crooked facial surgeon, it housed wax figures of infamous killers like Jack the Ripper and Bluebeard while also functioning as a Mob hideout. The setting allowed for identity changes through plastic surgery, alibi manipulation, and staging elaborate theatrical illusions. The atmosphere of deception made it ideal for the radio broadcast hoax and the trap set for Chan.

The wax museum's duality as both an attraction and criminal lair was established from the beginning.

The movie depicts four lethal attempts on Charlie Chan's life within eighteen tense minutes: a poison dart, a speeding bullet, a gleaming dagger, and the electrocution trap during the broadcast. Each attack was narrowly avoided as Chan navigated the dangerous situation. These attacks were part of the conspiracy to silence the detective and prevent him from exposing the criminal ring operating from the wax museum.

The summary explicitly mentions these attacks as the central danger of the film.