on Helping Writers become Authors:

The Third Act is what readers, writers, and characters have all been waiting for.
This final section of the story is the point. It’s what you’ve been building up to all this time.
If the First and Second Acts were engaging and aesthetic labyrinths, the Third Act is where X marks the spot. You’ve found the treasure. Now it’s time to start digging.
Like the previous acts, the Third Act opens with a bang, but unlike the other two acts, it never lets up. From this point on, everyone is in for a wild ride.
All the threads you’ve been weaving up to this point must now be artfully tied together.