How many books are there in the "In death" series?
51
3
3
3
3
4
3
2
4
5
3
2
4
5
3
2
4
5
3
2
4
5
3
2
4
5
3
2
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
4
5
3
2
1
6
4
5
3
2
1
6
4
5
3
2
1
7
6
4
5
3
2
1
7
6
4
5
3
2
1
7
6
4
5
3
2
1
7
6
4
5
2
1
7
6
4
5
2
1
7
6
4
5
2
1
8
7
6
4
5
2
1
8
7
6
5
1
8
7
6
1
8
7
9
6
1
8
7
9
6
1
8
7
11
9
6
10
1
8
7
11
9
6
10
13
1
8
7
11
9
6
12
10
13
8
7
11
9
6
12
10
13
8
7
11
9
6
12
10
13
8
7
11
9
6
12
10
13
8
7
11
9
6
12
10
13
8
7
11
9
12
10
13
8
7
11
4 books
3 books
4 books
2 books
7 books
5 books