Stay Out of the Basement  - R.L. Stine
Margaret and Casey Brewer are worried about their father. He spends all his time in the basement, doing tests on plants and on top of that, he is acting a little strange.But things are getting worse and he seems to be developing plantlike tendencies and they really worry when they meet some of his plants.I liked the first book better, but this one was good too. I really liked the last few chapters of the book, they got more intense. The ending was also good, but it leaves you wondering. Overall, good book.