Short Answer 
The story begins with Mr. Hyde committing a murder, establishing his violent character. Following the act, the police find evidence linking Hyde to the crime and enlisting Mr. Utterson’s help, they make important discoveries at Hyde’s house that deepen the investigation.
Step 1: The Murder Incident
Initially, the plot begins with an intense event where Mr. Hyde *murders a gentleman in the street. This shocking act sets the tone for the rest of the story, establishing Hyde’s violent nature and creating a sense of mystery around his character.
Step 2: The Investigation Initiates
Following the murder, the police discover key evidence that includes half of a walking stick found at the scene and a letter addressed to Mr. Utterson. This evidence is crucial as it connects the murder to both Hyde and Utterson, creating an urgent need for investigation.
Step 3: The Search for Answers
The plot continues as Inspector Newcomen enlists the help of Utterson to identify the body of the murdered man. Together, they visit Hyde’s house where they make significant discoveries, including another half of the walking stick and a burnt checkbook, which furthers the investigation into Hyde’s actions.