This is sent by the server to open a book, and by the client to change the title or author.

Offset Type     Name             Description
------ -------- ---------------- ------------------------------
 0000  BYTE     cmd
 0001  UINT     bookID
 0005  BOOL     iseditable
 0006  BOOL     isnew
 0007  USHORT   pages
 0009  USHORT   title_length
 0011  CHAR[]   title            0x00-terminated
       USHORT   author_length
       CHAR[]   author           0x00-terminated

Older Clients use the Book Header (0x93) Packet.