Barnardo, Marcellus, and Horatio all encounter a ghost that unmistakenly resembles the recently dead King Hamlet. Horatio is persuaded by the two men to try and address the ghost.
"..please, speak. Or if you’ve got some buried treasure somewhere, which they say often makes ghosts restless, then tell us about it. Stay and speak!" (Shakespeare 1,1,130).
Hamlet speaks with his father's Ghost after speaking with the men that had informed him of their sighting. The Ghost then explains to his son how he came to pass.
"I knew it! my uncle?" (Shakespeare 1,5,41).
"You should know, my noble son, the real snake that stung your father is now wearing his crown" (Shakespeare 1,5,36).
Hamlet has a company of actors come to Elsinore and put on a play he calls "Mousetrap". The play depicts a man poisoning his brother so that he may become king. Everything is exactly like how Claudius killed King Hamlet. Hamlet believes Claudius' reaction will allow him to decide whether or not what the ghost has told him is true.
"Turn on the lights. Get me out of here!" (Shakespeare 3,2,254).
"Evil thoughts, ready hands, the right poison, and the time is right too" (Shakespeare 3,2,239).
"Oh, my crime is so rotten it stinks all the way to heaven. It has the mark of Cain on it, a brother's murder" (Shakespeare 3,3,37).
After Claudius goes running from the theater area, he goes to his brother's grave. Hamlet watches Claudius pray and confess his sins at the graveside. Hamlet wants to kill Claudius but feels that Claudius will be sent to heaven if killed while confessing his sins and praying to God for forgiveness.
"My heart is as black as death, my soul is stuck to sin, and the more it struggles to break free, the more it sticks" (Shakespeare 3,3,65).
"Im still reaping the rewards of that murder: my crown and my queen" (Shakespeare 3,3,54).
Right before the epic downfall, we find that Ophelia has drowned herself after going mad from her father's death. In addition, Claudius has tried to get Laertes, Ophelia's brother, to want to avenge his father's death by killing Hamlet. They decide on a sword fight to the death. It is noted that Laertes is also distraught over his sister's passing.
"That was one hit" (Shakespeare 5,2,269).
"You got me, I admit it" (Shakespeare 5,2,279).
During the duel between Laertes and Hamlet, we find that Laertes blade is poisoned which cuts Hamlet and later is his demise. Before Hamlet dies he disarms Laertes and cuts him with this same blade. Meanwhile, Hamlet's Mother, Gertrude accidentally drinks from a poisoned goblet which kills her. Laertes snitches on Claudius with his dying breath and Hamlet stabs Claudius with the poisoned sword and then forces him to drink the rest of the goblet. This leaves Horatio alive, who pledges to tell Hamlet's story.
"Now a noble heart is breaking. Good Night, sweet prince" (Shakespeare 5,2,359).