OK...so let us get this all explained out for you guys...please don't be mad at us
First: "Et Tu, Brute" is one of the most famous of Shakespeare's lines. A Latin sentence meaning “Even you, Brutus?” is from the play Julius Caesar (Act III SceneI). Caesar utters these words as he is being stabbed to death, having recognized his friend Brutus among the assassins. These days, some os us use it to express surprise and dismay at the treachery of a supposed friend.
(Thank you Dictionary.com)
Having said that, our cipher is what is known as a Caesar Cipher. Supposedly, it's how the real Julius Caesar communicated with his generals. It is a type of substitution cipher in which each letter in the plain text is 'shifted' a certain number of places down the alphabet. For example, with a shift of 1, A would be replaced by B, B would become C, and so on.
By now, you're probably asking, "Well how the hell were we supposed to know how many places you shifted it, you jerk?" It's in the clue, silly! You don't think that we were going to let you flail around shifting letters for 90 minutes, did you? That leads us to the....
Second: "...exactly what we were needing. Season 4 of our favorite little shitshow..." Season 4...? 4...? It's a four place shift! A becomes E, B becomes F and so on down the road.
OK...we admit...there's a tiny part of us that wants to apologize for making this so difficult, but there's an even bigger part that's twirling our pointy mustache ends gleefully.