From the introduction:
Programmers send spybots to crawl over peoples’ email accounts and find their personal details. They look for important snippets and collect them so this information can be later used for advertising or other nefarious means.
Two of you together will play a pair of spybots connected across a vast multitude of email accounts. However, you have long been abandoned by negligent masters, left to crawl along the personal messages of strangers with no rhyme or reason. You read, collect, and read again, unable to serve any useful function with the information you find.
Left to years of loneliness, you reach out to each other to speak - but spybots have no language. You must construct one.