Single-Handed S04E04 - Between Two Fires (2)

Jack continues to find the person he believes torched Dennis Costello's abandoned house but finds himself thwarted every which way by both Costello and his former boss Jim Dooley. But is Jack looking in the right direction? Meanwhile, Gemma breaks up with Brian and he takes revenge by attacking Jack and then changing the locks on Eithne's home barring her entry.