If you look through the hole in a food with a hole (optimally a doughnut, but bagels and fried onion rings will work in a pinch) you can be transported to an alternate reality.  That reality is one in which faery tales are real.  And the wizard is using the denizens of this land as a massive resource for his businesses in our world, nothing like outsourcing to sorcerers…

Love Terry Pratchett?  I am pretty sure Holt is his brother by another mother. This is absurd British humor and if you like that kind of thing you will really enjoy this book.  If you think the very idea of looking through a doughnut and going to a land of knights and dragons is utterly ridiculous and you couldn’t deal with the very idea, please skip this book.