How many books are in The Underland Chronicles?
5
3
3
5
3
5
4
3
5
4
3
5
4
3
5
4
3
5
4
3
5
2
4
3
5
2
4
3
5
2
4
3
5
2
4
3
6
5
2
4
3
6
5
2
7
4
3
1
6
5
2
7
4
3
1
6
5
2
7
4
3
1
6
5
2
7
4
3
1
6
5
2
7
4
3
1
6
5
2
7
4
3
1
6
5
2
7
4
8
3
1
6
5
2
7
4
8
1
6
5
2
7
4
8
1
6
2
7
4
8
1
9
6
2
7
8
1
9
6
2
7
8
10
1
9
6
2
7
11
13
8
10
12
1
9
6
2
7
11
13
8
10
12
1
9
6
2
7
11
13
8
10
12
1
9
6
7
11
13
8
10
12
1
9
6
7
11
13
8
10
12
1
9
6
7
11
13
8
10
12
1
9
6
7
11
13
8
10
12
1
9
7
11
13
14
8
4 books
3 books
7 books
5 books
4 books