Boo Humbug by Rene Gutteridge is the latest book in the Boo series. It is shorter than the first three-Boo, Boo Hoo, and Boo Hiss. This book takes place at Christmastime and Lois is inspired to have a big Christmas theater production. I think that I liked the first three books a lot better overall. Boo Humbug is not as funny...and it doesn't seem to develop the characters anymore. If you want to read this book, I suggest you read the others first.