Numb3rs (2005)

S1E7 Counterfeit Reality

Don discovers that a group of counterfeiters is creating fake small-denomination bills, and they've kidnapped an artist to help produce the designs. With time running out, Don worries that the artist's life is in danger once her work on the counterfeit cash is complete. The criminals have already killed at least five individuals, including two who attempted to steal from them. Complicating matters further for Don, his ex-girlfriend, who now works as a Secret Service agent, is brought onto the case.