This article is about the main Book Antagonist. For the online Vesper One, see BlackWolf360

Vesper One
Vesper One - Card Front
First Post Greetings, Cahills
Alias The Psycho One

Vesper One is the most deranged, criminal psychopath you could ever hope (or not) to meet. He is the main antagonist of the Cahills vs. Vespers Series. Nobody knows who he actually is (bearing similarities to RedPuppy47, as Red himself was quick to point out when he invited him to a game of golf). His identity was revealed in Book Six, Day of Doom, much to the disappointment of many fans. He has been impersonated many times with people claiming to be him left, right and center before it fell out of fashion.

On August 5th 2012, Vesper One himself officially infiltrated the previously safe haven of the Message Board. His first post was posted on 8/8/12. By the average time it takes for an account to be activated, this means that he possibly 'Signed Up' (???) on 8/5/12. Coincidentally, this is also the day that the first 'I AM VESPER ONE' post for a while was posted - it is unknown if the two events are connected. However, BreakingAggressive124 thinks he may have created this post on his backup account,which means it is most likely a coincidence.

Vesper One has also posted a second message on the MB, this time titled "Hello again". In the post, he gives the agents two codes. With help from Evan Tolliver, the agents were able to decode Vesper One's messages which were:

- Not a stranger

- Born in America

Vesper One also asked to be invited to the Spring Fling, an ongoing MB event similar to the prom.

Vesper One is a Tomas, according to the branch test he took when he first created his account. Vesper One's post is rumoured to be written by Gavin B, though there is no proof that he was indeed cosplaying Vesper One.

Vesper One's first post can be found here: