context: Henry Jekyll (John Barrymore) is a doctor of medicine, but he is also an "idealist, philanthropist." When he is not treating the poor in his free clinic, he is in his laboratory experimenting. Sir George Carew (Brandon Hurst), the father of his fiancÃ©e, Millicent (Martha Mansfield), is "piqued" by Dr. Jekyll. "No man could be as good as he looks," Carew says. Following dinner one night, Carew taunts Dr. Jekyll in front of their friends, Edward Enfield (Cecil Clovelly), Dr. Lanyon (Charles Lane) and Utterson (J. Malcolm Dunn) proclaiming "In devoting yourself to others, Jekyll, aren't you neglecting the development of your own life?" "Isn't it by serving others that one develops oneself?" Jekyll replies. "Which self?" Carew retorts. "Man has two - as he has two hands. Because I use my right hand, should I never use my left? Your really strong man fears nothing. It is the weak one who is afraid of experience. A man cannot destroy the savage in him by denying its impulses. The only way to get rid of a temptation is to yield to it. With your youth, you should live - as I have lived. I have memories. What will you have at my age?"
  And thus the seed is sown, and Jekyll begins his experiments. As he observes, "Wouldn't it be marvellous if the two natures in man could be separated - housed in different bodies? Think what it would mean to yield to every evil impulse, yet leave the soul untouched!" Finally, Jekyll develops a potion that turns him into a hideously evil creature that he calls Edward Hyde. As this creature, he is not recognizable as Dr. Jekyll, and, so, to facilitate the comings and goings of Hyde, he tells his servant, Poole (George Stevens), that Hyde is to have "full authority and liberty about the house."
  
  
  
  
  John Barrymore (right) as Mr. Hyde with an uncredited Louis Wolheim as a dance hall owner.
  Jekyll thus begins to live his double life. Hyde sets up a room in one of the seediest parts of London. He brings in a girl from the dance hall, Gina (Nita Naldi), to live with him there and frequents opium dens, dance halls, and bars - any place that satisfies his evil desires. Although Jekyll has developed a potion that will also return him to his original appearance and character as Dr. Jekyll, each time he takes the potion to become Edward Hyde, he worsens. He not only looks more evil, he becomes more evil, as well.
  Millicent Carew is worried about the absence of her fiancÃ©, so Sir George goes to call on Jekyll to see what is the matter. Although Jekyll is not home when he calls, Sir George encounters Hyde in the street just as he knocks a small boy to the ground injuring him. To make recompense for his actions, he goes and gets a check which he returns to the boy's father. Carew notices that the check has been signed by Dr. Jekyll. He confronts Poole who tells him the story of Edward Hyde.
  In the meantime, Hyde/Jekyll has returned to the lab and, after drinking the potion, returns to his original self. Sir George finds him in the lab and demands to know his relationship with "a vile thing like Hyde?"
  
  
  
  
  moody lobby poster
  "What right have you to question me - you who first tempted me?" says Jekyll. Sir George angrily retorts that unless Jekyll is forthcoming with an explanation, he must object to his marriage to Millicent. This angers Jekyll to the point that he suddenly becomes Hyde, right in front of Sir George's eyes, without benefit of the potion. Sir George runs into the courtyard where Hyde catches him and clubs him to death with his walking stick. Hyde runs to his apartment and destroys any evidence that may link him to Jekyll. He eludes the police by only minutes and returns to his lab where he is able to drink the potion that restores him as Jekyll.
  In the ensuing days, as Millicent grieves, Jekyll is tortured by his misdeeds. Soon, the drug needed to make the potion that will return him as Dr. Jekyll is depleted and cannot be found in all of London. Jekyll stays locked up in his lab fearing he may become Hyde at any moment. Millicent finally goes to see him, but just as she is about to enter the lab, he begins to transform into Hyde. Jekyll consumes the poison in the ring he took from the Italian dancer before he opens the door, fully transformed into Hyde. He lets her in, locks the door and grabs her in his arms. Suddenly, he starts convulsing. Millicent runs from the lab and when Lanyon comes in, he finds Hyde sitting in a chair, having just died, and his appearance returned to that of Dr. Jekyll. He discerns that Jekyll committed suicide, and calls the others (Poole, Utterson and Millicent) in, but declares to them that Hyde has killed Dr. Jekyll. In the final shot, Millicent is grieving next to the body of Dr. Jekyll.
question: who  attends a party at the home?
answer: Jekyll holds a dinner party, which both Utterson and Lanyon attended.