Acomputer technician updates a computer for a client, then trades in the replaced computer to a computer shop for cash. The shop-owner passes it on to an employee, Donald Taylor, for his personal use. But when Taylor later connects it up, he discovers it contains data relating to a proposed terrorist bomb attack in Melbourne.

The terrorist group realise their data is compromised and enter the shop to retrieve their old computer. They establish where it is, then murder the shop-owner. Police arrest Taylor for the murder, but not before he informs ASIO in Canberra of his discovery.

To identify the computer's previous owners, police and ASIO must find the computer technician, who's vanished without trace. They have two weeks to find and thwart the terrorists.