Now Hyde has disappeared Jekyll seems to be more happy, till suddenly depression took him and Lanyon is on his death bed and hints Jekyll is the cause. Jekyll falls 'under a dark influence'. Utterson receives a letter form Lanyon that he can not open till Jekyll's death.
Chapter Nine: Dr Lanyon's Narritive
Utterson and Enfield walk past Jekyll's window, where they see him confined. His face has a look of 'abject terror and despair'. Shocked they leave.
Chapter Ten: Jekyll's full statement of the case
Poole visits Utterson where he takes him back to the house where they find a voice like Hyde's looked up demanding certain chemicals. They break down the door and find Hyde shaking and dying with a will now leaving every thing to Utterson. He then goes back to read his statement and Lanyons's letter.
Lanyon's letter describes how he was told to collect some vials and give them to Hyde. He then witnessed him transform into Dr Jekyll, causing Lanyon to fall ill.
Jekyll tells his story of how he separated his good and bad side, and how it turns him into Hyde who is now taking more control. Hyde then stays permanently causing himself to commit suicide.
Utterson finds Jekyll looking sick, who shows him a letter from Hyde which looks like it was forged to cover for him.