- The Alanna Series by Tamora Pierce---this is a great quartet!
- Catching Fire is a great sequel to The Hunger Games....but Mockingjay was not my favorite
- The DaVinci Code is a great sequel to Angels and Demons
- Anne of Green Gables series....the second book, Anne of Avonlea is a great addition to the first book..and I like the rest of them too
- Little Men is a good sequel to Little Women
- Sisterhood of the Traveling Pants...the second one is good for sure...I can't remember the third one and I'm not sure if I've read the fourth
- Harry Potter series....each book seems to get better which is nice :)
- The Face on the Milk Carton...this quartet is great...but it is actually has five books in it--the fifth book was published earlier this year and I'm excited to read it, someday :)
- Emily of New Moon, Emily Climbs, Emily's Quest...also L.M. Montgomery...this is a great trio too :)
Ok so I couldn't come up with a 10th...but I did think of this: Steve Berry wrote the Cotton Malone series..I have only read one--not knowing it was like the 7th...it was called Jefferson Key. I thoroughly enjoyed it...and I want to read this series....in actual order now.