The first series of this detective drama comes to an end tonight with the search for an elusive serial killer leading the TAU to uncover a shocking secret. What is the TAU you might wonder? Well it's the Threat Assessment Unit which assess the threat level in stalking cases, with Detective Jack Larsen (Dylan McDermott) and Lieutenant Beth Davis (Maggie Q) at the helm. Not a bad show and sure everyone knows the finales of these detective dramas make for exciting viewing.