When he finds out who killed his father, a laid-back youngster must return to save everyone from his evil Uncle and become the rightful king

Come on. ?The Lion King is Hamlet.

Move it to a huge corporation like the Murdocks.

In terms of content, if you're deliberately writing a modern twist on Hamlet, more specific details of your setting are needed to help sell it - "laid back" doesn't really give a clear description of the protagonist. Is he a college student? Does he work a dead-end job? Is he in a band? And King of what?

In terms of structure, there is a passiveness to your logline which makes it a bit dry. Perhaps?something like this would spruce it up? "After the murder of his father, a young prince must?return home to confront his power-hungry uncle?and?take his rightful place as king." It still isn't great but it is slightly less wordy with more immediate action.

Good! I Guess this is The Lion King. Maybe you should?write that the main character ?is a ?prince or that he need to save his family and loved ones from his evil uncle.

/Julia