Hiller, a computer expert, was bribed by group of bank robbers to obtain details of the security system at a newly-built bank. Having obtained the information, he thought he'd seen the last of the robbers. But now they've traced him and his son to London. They hold the son hostage and force Hiller to decode the information about the alarm and then to take part in the robbery.

In 2020, DCI Billy O'Connell is tasked with tackling an armed suspect who takes a group of Russian immigrants hostage in a lift after blaming the immigrant population for an outbreak of tuberculosis that killed most of his family