299X: Boy eats brownie, turns into a cat (Solved)

I read this book probably in the early 1970s.  This is what I remember: a boy lives in an apartment building, something’s weird with one of the neighbors, there’s a brownie that he eats, just a few bites at a time, I think, he notices strange things happening to him, and ultimately, he eats enough brownie and turns into a cat and sneaks into the neighbor’s apartment through an open window ledge.

3 thoughts on “299X: Boy eats brownie, turns into a cat (Solved)

  1. That’s it!! No Such Thing as a Witch! Thank you once again for solving the mystery of the forgotten book 😉

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