Don't be confused, but my third book finished, Three Times Lucky by Sheila Turnage, actually falls in the fifth category on the Reading Challenge (a book with a number in the title).
I really enjoyed this book. It's my favorite sort of book - likeable characters, in situations I really don't have to deal with. Pure entertainment.
Mo is a girl who is in search of her Upstream Mother, until she realizes that what she's got is probably better than anything else could be. But she's also figuring out that things aren't always what they seem to be. With her best friend Dale, they are not only learning secrets about those around them, they're solving a kidnapping and maybe even a bank robbery - non-stop action :)
I'm curious about the author's other book based on the same characters. While I'd probably like to read it sometime, I'm not sure where it would fit in the challenge right now, so I'll just keep it in the back of my mind.