Chapter 1 - Story of the Door

Utterson and Enfield are out for a walk when they pass a strange-looking door (the entrance to Dr Jekyll's laboratory). Enfield recalls a story involving the door. In the early hours of one winter morning, he says, he saw a man trampling on a young girl. He pursued the man and brought him back to the scene of the crime. (The reader later learns that the man is Mr Hyde.)

A crowd gathered and, to avoid a scene, the man offered to pay the girl compensation. This was accepted, and he opened the door with a key and re-emerged with some money and a large cheque.

Utterson is very interested in the case and asks whether Enfield is certain Hyde used a key to open the door. Enfield is sure he did.

Chapter 2 - Search for Mr Hyde

That evening the lawyer, Utterson, is troubled by what he has heard. He takes the will of his friend Dr Jekyll from his safe. It contains a worrying instruction: in the event of Dr Jekyll's disappearance, all his possessions are to go to Mr Hyde.

Utterson decides to visit Dr Lanyon, an old friend of his and Dr Jekyll's. Lanyon has never heard of Hyde, and not seen Jekyll for ten years. That night Utterson has terrible nightmares.

He starts watching the door (which belongs to Dr Jekyll's old laboratory) at all hours, and eventually sees Hyde unlocking it. Utterson is shocked by the sense of evil coming from him.

Utterson goes next door to warn his friend, Jekyll, against Hyde, but is told by the servant, Poole, that Jekyll is out and the servants have all been instructed by Jekyll to obey Hyde.

Utterson is worried that Hyde may kill Jekyll to benefit from the will.

Chapter 3 - Dr Jekyll Was Quite at Ease

Two weeks later, following a dinner party with friends at Jekyll's house, Utterson stays behind to talk to him about the will.

Jekyll laughs off Utterson's worries, comparing them to Lanyon's 'hidebound' (conventional and unadventurous) attitude to medical science. The reader now sees why Lanyon and Jekyll have fallen out, and starts to understand that Jekyll's behaviour has become unusual.

Utterson persists with the subject of the will. Jekyll hints at a strange relationship between himself and Hyde. Although he trusts Utterson, Jekyll refuses to reveal the details. He asks him, as his lawyer not his friend, to make sure the will is carried out. He reassures him that 'the moment I choose, I can be rid of Mr Hyde'.

Chapter 4 - The Carew Murder Case

Nearly a year later, an elderly gentleman is brutally clubbed to death in the street by Hyde. The murder is witnessed by a maid who recognises Hyde.

A letter addressed to Utterson is found on the body and the police contact him. He recognises the murder weapon as the broken half of a walking cane he gave…