Hamlet - The Text Adventure

Some clever chap has rewritten Shakespeare's Hamlet so that it's an interactive text-based adventure.

Presented with the following description, do you fight, flee south, or talk to the ghost?

You are on the palace balcony. Bats are flapping around in the twilight. Miles and miles of crinkly Danish
countryside stretch out below you. A ghost is here. An exit leads south.

Be warned: this isn't a mindless hack-and-slash. Attacking the ghost yields no treasure and does not damage it. Can you escape your fate?