What is is with Threes?

Today I get to welcome Stephen Zimmer back to my blog with another Rayden Valkyrie novel. Hurray! And there's even a chance to win signed copies of the whole trilogy! It's a trilogy I've been reading and following and enjoying... and it got me wondering, what is it about 3s and Trilogies. So I asked Stephen, and here's his reply.

Trilogies and the Three-Act Narrative
By Stephen Zimmer
Many of the great stories have been told in the form of trilogies, whether in book or movie form.  The...