How does the theme of deceit continue in act 4 of Hamlet?

In Act 4 of Hamlet, the theme of deceit intensifies as characters manipulate and betray one another. Claudius's duplicity is evident in his scheming to eliminate Hamlet, using Laertes as a pawn in his plot. Meanwhile, Hamlet himself engages in deception, feigning madness to mask his intentions. This web of lies ultimately leads to tragic consequences, highlighting the destructive power of deceit in the pursuit of power and revenge.