Writing a story without dialogue

It’s all about imagination at this point.
Now that I am a few chapters into this first draft of Casebook 10, I’ve discovered something interesting: Portia can’t hear or speak… so I have no dialogue to write. If you’ve never written scene after scene that are just descriptions with no actual speaking, then you should try it once. It’s not easy to keep up interest without it, and the page looks like a block of text.
I’m going to find some new tricks to keep the text flowing and vital – any ideas friends?