Sister Honour Langtree (Wendy Hughes), is in charge of a military hospital for psychiatric patients. She however transgresses boundaries by developing a sexual attraction for a new patient.
Harry Wingate, a rugged adventurer, is hired by a gem collector to retrieve a priceless opal, known as "The Blue Lightning," from Lester McInally, a super-criminal with an army of killers operating in the Australian outback.
