story: A spy wrote a secret message on a piece of paper. He then folded it up and placed it in a library book. He took the book back to the library and hid it in the stacks. Soon after, another spy picked up the book. He flipped through the pages and took secret message.
 selected sentence: Soon after, another spy picked up the book.
Another spy want(s) to know Secret_A >Motivates> Another spy picks up the book