Visiting his uncle's cattle station in the Australian outback, Tom is thrilled when old Sam offers to take him and his cousin, Greg, walkabout.

But trekking through the wilderness, the trio are appalled to stumble across an illegal drug laboratory experimenting on animals. Suddenly their lives are in jeopardy. Greg is captured, and Sam must forge onwards in an attempt to get help. Tom finds himself alone under the unforgiving sun, his food supplies dwindling. Meanwhile the lab workers plot to flee the country, and to dispose of Greg along the way.

But the outback holds dangers that even scheming criminals cannot avoid. Kyrek the crocodile watches from the riverbed, assessing his prey. And when finally they take to the water, Kyrek moves in for the kill ...