Final answer:
Mr. Utterson learns that the handwriting in Hyde's letter to Dr Jekyll is similar to Jekyll's, suggesting a closer connection between them.
Step-by-step explanation:
In Robert Louis Stevenson's novel, 'The Strange Case of Dr Jekyll and Mr Hyde', Mr. Utterson learns something significant about a letter sent to Dr Jekyll by Mr Hyde. Utterson discovers that the handwriting in Hyde's letter to Jekyll resembles Jekyll's own style, but inclined differently. This finding leads to suspicions regarding the relationship between Jekyll and Hyde and raises questions about whether Hyde has been forging Jekyll's handwriting or if there is a deeper connection between the two.