Why was Karl in the mental hospital?

What are Karl's plans after he gets out?

Describe the relationship between Karl and Frank.

What is Doyle's reason for hating Vaughn? Is this hatred justified?

Who is Melinda?

Why does Linda stay with Doyle?

How does Karl's life change after he meets Frank and Linda?

What happened to Karl's little brother?

How does Karl prepare for his actions against Doyle?

Is Karl justified in killing Doyle?