Short Answer 
Mr. Utterson investigates the troubling connection between his friend Dr. Jekyll and the mysterious Mr. Hyde, whose heinous actions lead to a murder and further tragedy. As Utterson uncovers dark secrets, including finding Hyde’s body in Jekyll’s lab while Jekyll is missing, he becomes increasingly desperate to uncover the truth, especially after receiving a critical letter from the late Dr. Lanyon.
Step 1: Mr. Utterson’s Investigation
Mr. Utterson, a close friend of Dr. Jekyll, becomes increasingly concerned about the mysterious figure of Mr. Hyde. He learns that Dr. Jekyll has a troubling connection to Hyde, which leads him to investigate further. Despite his efforts, Utterson discovers that Jekyll is reluctant to discuss Hyde, hinting at a deeper, darker secret.
Step 2: The Tragic Events Unfold
As the story progresses, Mr. Hyde commits a heinous crime, resulting in a murder that sends shockwaves through the community. This incident causes both Dr. Jekyll and Dr. Lanyon to fall seriously ill. Lanyon, upon his death, leaves a crucial letter for Utterson, indicating that it should only be read if Dr. Jekyll dies or goes missing, adding urgency to Utterson’s quest for answers.
Step 3: The Shocking Discovery
In a dramatic turn of events, Mr. Utterson discovers the lifeless body of Mr. Hyde in Dr. Jekyll’s laboratory, but Dr. Jekyll is nowhere to be found. This intensifies the mystery surrounding their connection and Jekyll’s fate. Utterson returns home to read the important documents left by Lanyon, hoping to unveil the truth behind these tragic occurrences.