Catherine gets her skates on and goes undercover at a roller derby, after a victim's secret life is uncovered; Doris has a run-in with a burglar.
Adam is tackling an assignment aimed at tearing down organised crime on the island but the chlorine gas bait he uses to nab a kingpin is acquired by the wrong side; Adam has doubts about Jessie.
Sawyer is forced to perpetuate his lie when some old friends drop in unannounced.