When a vital piece of evidence goes missing from the station, Tom has to face the unpleasant prospect that one of his team might be corrupt. As the accusations fly, Monica Draper arrives to conduct an investigation. Both Adam and Dash comes under scrutiny - both have a connection to the case and both had the means and opportunity. The stolen evidence, a videotape, incriminates Dash's ex-teacher - a woman who had a profound influence on Dash and convinced her to join the force.