There IS going to be a fourth Monstrumologist book.

From Rick Yancey's Facebook page:

I have just received confirmation that one week after the campaign began, Simon & Schuster has reversed its decision and will publish the fourth volume of Will Henry's journals.

Monstrumology lives. I didn't bring it back to life - so don't congratulate me. Toast yourselves, honorary monstrumologists, for YOU did it. In the words of Eliot Ness, "Never stop. Never stop fighting till the fight is done. Here endeth the lesson."

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Previously.