What is the problem of the
story, as expressed in one
sentence?

This is the problem, the issue, or the topic of your non-fiction book. And it needs to have a “hook” or something that will immediately capture attention.

Explanation:

I haven't a clue as to what story you are talking about, but here are a couple of sentences that I hope somehow in some way answer the question that you asked.

covert: hidden or secret

candid: truthful and straightforward

what i get from these phrases is covert means undercover or underground and that's where the flower is in april. on the other hand, may is the month where flowers start to bloom and thats the reason why candid is being used as a word to describe the blossoming period of a flower.

hope this answer you.