The play’s the thing wherein I’ll catch the conscience of the King.
Polonius has noticed that Hamlet has wanted to be with his daughter but has forbidden Ophelia to see Hamlet. Because of his suspicions about Hamlet, Polonius goes to the king to figure out what is wrong with Hamlet.
Becoming worried about Hamlet themselves, the King and Queen try to spy on him. They ask Hamlets best friends, Rosencrantz and Guildenstern, to find out what is wrong but Hamlet immediately sees through their act.
This is the first time we see Hamlet deciding to take action against Claudius in hopes of avenging his father. Hamlet comes up with a plan to guilt King Claudius into admitting to the murder of King Hamlet.