Actors Kathleen Robertson and Mark Engelhardt have bagged recurring roles opposite Justin Hartley and Fiona Rene in the hit CBS series `Tracker`.

Based on the bestselling novel The Never Game by Jeffery Deaver, Tracker stars Hartley as Colter Shaw, "a lone-wolf survivalist who roams the country as a reward seeker, using his expert tracking skills to help private citizens and law enforcement solve all manner of mysteries while contending with his own fractured family," per the official logline, Deadline reported.