Karen Pelly:  I think I got a good lead on a cold case .
Davis: Hey , great work rookie . What is it ?
Karen Pelly: Well , take a look at this picture of the water tower .
Davis: Not " Grad ' 68 " .
Karen Pelly: This picture was taken in 1972 .
Davis: How much did it cost to get these pictures blown up ?
Karen Pelly: But look the water tower 's unmarked .
Davis: You got 'em dry - mounted , that 's like 20 bucks each !
Karen Pelly: Why would someone paint " Grad ' 68 " if it was n't 1968 ?
Davis: I do n't know . But if you figure that _ one _ out , you 'll be halfway to ; I do n't give a damn !