Custom post type. Display

Hello everybody.
I has custom post type “Book”. I has custom post types (parent pages) and child pages.
I need display all posts (of my custom post type “Book”) in next view:

Post_parent_1
– Child_1_of_Post_Parent_1
– Child_2_of_Post_Parent_1
– Child_3_of_Post_Parent_1
Post_parent_2
– Child_1_od_Post_Parent_2
– Child_2_od_Post_Parent_2
– Child_3_od_Post_Parent_2
Post_parent_3
– Child_1_od_Post_Parent_3
Etc
I try wrote code, but this don’t work…

[Code moderated as per the Forum Rules. Please use the pastebin]

Thanks all.