He simply turns pale
Utterson's disbelief in the supernatural
Utterson met with Jekyll at Jekyll's house after the murder. Jekyll seemed nervous and unwell during this meeting, which raised Utterson's suspicions about his friend's involvement in the crime.
mr utterson thought that dr jekyll had been murdered
Jekyll wants Utterson to have the letter as a form of insurance, to ensure that if anything happens to him, Utterson will be able to understand the truth about Hyde and Jekyll's relationship and take appropriate actions.
Mr. Utterson suspected Dr. Jekyll was lying based on inconsistencies in his behavior and the mysterious relationship between Dr. Jekyll and Mr. Hyde. Through his investigations, Mr. Utterson uncovered the truth about their connection and Dr. Jekyll's secret experiments.
He was concerned about dr.jekyll's will
Utterson fears for Jekyll's life because he notices a change in Jekyll's behavior and appearance, connecting it to the sinister Mr. Hyde. He is concerned about the influence Hyde has over Jekyll and worries that Jekyll may be in danger due to his association with him.
Utterson started by piecing together information from various sources, such as witnesses and handwriting analysis. He then confronted Jekyll and Hyde directly, seeking an explanation from Jekyll. Finally, Utterson discovered Jekyll's confession letter, which provided the definitive truth about their relationship.
Dr. Jekyll compared Mr. Utterson to a plaster image in the dinner party conversation.
Poole contacts Utterson because he is concerned about his master, Dr. Jekyll, who seems troubled and in distress. He wants Utterson to come see Jekyll for himself and possibly offer help or insight into the situation.
Utterson suspects that Dr. Jekyll forged Hyde's note because he finds it implausible that Hyde would write a letter in such a polished and formal manner. Additionally, the note appears to be written in Jekyll’s own hand, raising Utterson's suspicions about the connection between the two men. Utterson's growing concern for Jekyll's well-being and his knowledge of Jekyll's character lead him to believe that the note is a ruse to protect Hyde.
Utterson was worried about Jekyll's will because it named Edward Hyde as the sole beneficiary, which seemed suspicious given Hyde's questionable character. Utterson was concerned that Jekyll might be under duress or influence from Hyde when creating the will.