Numb3rs Fanfic Finders

Hey guys, I recently got back into Numb3rs after re-watching the season sets, and I've been trying to find an old AU that was a crossover with Pretender (if I remember correctly, Pretender characters were actually referenced, but they weren't focused on). Long story short, Charlie and Don meet through his consulting work. Don doesn't know that Charlie is his brother, because he was kidnapped when they were kids. Both of their parents are dead, and it basically deals with the aftermath of Don finding out that they're related since they were lovers.

Any help would be great, because I keep coming up blank, and I know it's been a while since I've read it...thus, there's a lot to go through.