What tragic event happened while Hamlet was away? How?

Queen Gertrude meets Ophelia, who is singing sad songs and speaking strangely. When Claudius joins them he tells Horatio to watch her and declares 'this is the poison of deep grief: it springs / All from her father's death.

there was a box in a bag in front of a house with a paper with it.a girl used it for an example, she then got a letter and went on a trip to go to a party in   a cabin and she only said one word""

a

explanation:

because i the point in view is between characters