Macbeth Act 4, Scene 2 Summary

At Fife, in Macduff's castle, Lady Macduff is lamenting to Ross that her husband has run away, which, sure makes him look suspicious.
Also, abandoning your family with no defense is seriously uncool. It's cool, Ross says. Macduff had his reasons.
Lady Macduff then has a funny bit of banter with her young son about how his father is dead.
Before she can go to market to buy a new husband (as she says), a messenger enters advising her to flee with her children.
Since she's innocent, she sees no reason to leave.Try telling that to the murderer, who enters claiming that Macduff is a traitor.
Macduff's son retorts, is stabbed, and then dies, leaving the murderers to pursue mom.