While trying to help Jake get over a breakup, Alan discovers that it was Charlie who stole his high school girlfriend. Alan seeks revenge on Charlie by following the same advice Charlie dispenses to Jake.
While Alan and Jake are away on a road trip, Charlie is visited by the ghosts of his ex-girlfriends.
A serial killer taunts the CSIs by leaving them cryptic hints, and the longer it takes them to decode these puzzles, the higher the death toll rises.
