Writing Promps Help?

I found this writing propt that sounds very interesting- "A character knows a secret that would destroy one person’s life but save the life of a

I found this writing propt that sounds very interesting-
"A character knows a secret that would destroy one person’s life but save the life of another person"
I reall want to use this prompt but I can't think of a secret that fits into that.

Ex. Z knows secret that would destroy sister, X's, life but would save Y's life if somone found out.

or:I found this writing propt that sounds very interesting- \"A character knows a secret that would destroy one person\u2019s life but save the life of another person\"I reall want to use this prompt but I can't think of a secret that fits into that. Ex. Z knows secret that would destroy sister, X's, life but would save Y's life if somone found out.

Tags:life,sound,found,