S5·E39 Hunted

Maggie's life is turned upside down when her brother, Robbie, shows up after having escaped from gaol. When she can't give him the help he expects, he takes off and the Heelers begin an extensive search. However, what appears to be a simple job turns into a frightening chain of events - a speed boat show goes terribly wrong and Maggie finds herself in a struggle to save the life of a five year old boy from the hands of a determined killer.