What attempts are made by Mr. Utterson to learn about Hyde ?

Utterson examines Dr. Jekyll's will, which he remembers had strange stipulations referring to the Mr. Hyde Enfield discussed.

Utterson goes to visit Dr. Lanyon, another dear friend of Dr. Jekyll's. When the men begin talking about Jekyll, Utterson discovers that Lanyon has not spoken to Jekyll for a long period of time due to a disagreement over "unscientific balderdash." Utterson also learns that Lanyon has never heard of Hyde.

Utterson begins to haunt the streets around the mysterious door, looking for Mr. Hyde to either enter or exit the portal. One night, he finally runs into Mr. Hyde and confronts him as he is about to enter the building.

Utterson goes to see Dr. Jekyll, but Poole, Jekyll's butler, reports that the doctor is not at home. From this conversation, Utterson gleans that Jekyll's house, around the corner from the mysterious door, is L-shaped, and that Hyde's mysterious door is actually an entrance to Jekyll's old dissecting room.

 Utterson decides that Hyde must be blackmailing Jekyll, perhaps for some terrible act he committed earlier in his life.