Numb3rs Fanfic Finders

Hi!
I'm looking for this fic where Charlie was kidnapped by a group of criminals that used him to plan heists. Charlie had lost his memory and couldn't even remember his name. Don goes in undercover in the group to get Charlie back, in the undercover role he guards Charlie whom I think he calls C. (It may have evolved into Don/Charlie but I'm not sure)
Anyone?

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