This is a review by my daughter, Aislinn (11).
"There is a competition to make the most disgusting gloop. Two children, Gerald and Gene, enter it, but they don't know that the man they send their gloop to is an evil criminal mastermind, Professor Baaad. In the morning their gloop has grown into a monkey called Fleabag Monkeyface. He has superpowers, like Banana Breath and Supersonic Earwax, which helps him destroy Professor Baaad's inventions.
It's a great book, with lots of details. The pictures are extremely good, and the book is very funny. Once I'd started it I couldn't put it down. It's a very funny book. I would recommend for about 8 to 11 year olds."