The depression of Victor

Victor's dad writes Victor and tells him that his brother William was murdered, and there were finger marks on his neck. Victor goes to Geneva immediately, but when he arrives it's already late and all the gates are locked. Victor started to walk in the woods and go to where his brother William was killed. He saw the monster lurking in the woods so Victor started to think that the monster was responsible for killing his younger brother. When Victor returned home though, he learned that Justine was accused of the murder because William took a picture from Elizabeth before he was killed and it was found in Justine's pocket. Victor tried to help Justine and tell everyone that she was innocent but Victor was afraid that if he kept going people would think he was insane due to the harsh evidence against Justine. She admitted to the crime thinking she would gain salvation but told Elizabeth and Victor that she is innocent. Justine was executed for the murder of William.
Victor could have stopped Justine from being executed if he just told everyone of the monster he created, but again he didn't want to tell anyone. Because of that, Victor started to feel guilty knowing the monster he created killed William, and allowed Justine to be executed. Another theme: GUILT.
Victor feels so guilty that he has thoughts of suicide and becomes depressed. Alphonse tried to cheer up Victor and took his family to a home in Belrive to get away from everything. Victor wanted to clear his mind with the scenery so he went to the summit of the Montanvert. It did the opposite, there he saw the monster he created and the monster invited him into a cave where he started to tell Victor about what has been going on in his life.