I believe that the answer is “ they aren’t sufficiently brief” because the irony is that he’s expected to make brief summaries so since they aren’t brief then that’s irony.
The chain starts from God and progresses and downward to angels, demons (fallen/ renegade angels) so the answer is god
The Secret Garden is about a recently orphaned girl who went to live with a family member. During her time she made friends and learned more about her mother in the process. One day she stumbles upon a garden that was to remain locked. She knew this secret couldn't be kept so she found a way to get inside. What she discovered inside is full of adventure and love.
Hope this helps