Hamlet joins Horatio and Marcellus for the watch while Claudius drinks the night away inside. The ghost appears and beckons Hamlet to follow. The other men try to convince the Prince not to go after the apparition for fear that it will lead him into danger. Hamlet will not listen and departs with the ghost. Horatio and Marcellus decide that they must follow.
Hamlet: Novel Summary: Act 1, Scene 4