Abby accused!

The cybersecurity boss comes under fire when a dark secret about the hijacking is revealed...

- HANNAH DAVIES, REBECCA FLETCHER, SEAN MARLAND

Abby Aysgarth faces some difficult questions when it's revealed she wrote the computer code that was used to hijack the Heart of Britain train! The acting technical director of the National Cyber Security Centre created the program as part of a British operation to try to take control of a train in Iran.

With the same code used for the attack on the UK rail network, GCHQ director general Nicola Miller (Pamela Nomvete) begins to wonder if Abby (Alexandra Roach) is behind the hijacking!