Why does poole visit Mr.Utterson personally and where does he escort him?

In Chapter Eight, Utterson is sitting at home by his fireplace when Poole, Jekyll's butler, calls on him. Poole appears quite distraught, and Utterson offers him a glass of wine to calm his nerves. Poole accepts, although he leaves the wine untouched. Poole reveals that he has come to Utterson in desperation. He is severely concerned about Dr. Jekyll's well being, as the man has been locked in his cabinet for weeks and allows no one to see him. he escorts him to Jekyll's home.