Verified the patch "2482857-27.patch" mentioned in #27, the child nodes are now accessible after applying the patch
Steps performed to verify the patch:
1.Created a Book page "Test Page"
2.Created child nodes "Test page 1" and Test page 2".
3.Deleted the "Test Page" , while deleting got an error "The website encountered an unexpected error. Please try again later." on a second attempt it got deleted
4.Accessed "Test page 1" and "Test page 2" and got error "( ! ) Fatal error: Call to a member function access() on a non-object in C:\wamp\www\drupal\core\modules\book\book.module on line 233"
5.Applied the patch and repeated steps 1 to 4 with book names as "New Page" and child nodes as "Child page 1" and "Child page 2"
6."New Page" got deleted without any exception error and I am able to access "Child page 1" and "Child page2" without any fatal error.
7.However still the fatal error is displayed for "Test page 1" and "Test page 2" (the child pages created before applying the patch)
So if the point no 7 is meant to be like that then the issue can be marked as RTBC from the testing.