Numb3rs Fanfic Finders

I read a story a year or so ago where Colby was dyslexic, always writing a certain letter (B I think) backward. He was kidnapped after the episode with Ian in the prison, he was drugged and believed to be dead. He escaped and left a message in a pay phone booth for the team to find before he was captured again.

Don got captured somehow and thought it was Ian who took them.

( Possible Trigger Warning )

I have no idea what the title of this story is and I've lost the link, but it's one of my favorites, so any help you guys can give me would be really appreciated! :)

~Sun_Spark02