Rookie Blue 5x04 "Wanting" - Plot

When a tenement-building shooting leads to the discovery of an executed gang leader, 15 Division must race to find the killer before a gang war breaks out. As the murderer zeroes in on the one witness who can tie him to the crime, Andy (Missy Peregrym) and her rookie, Duncan (Matt Murray), are put to a life-and-death test of true police heroism.