The Commander - Virus (Part 2 of 2)
First aired: May 24, 2018.
Blake's own sister Sarah, who is terminally ill with cancer, moves in with her, but finds that her many personal affairs are too much to bear. Meanwhile, the hacker threatens to kill another patient every 24 hours if he doesn't receive a grand total of twenty million pounds. Enlisting the help of DI Ken Miles of the Computer Crime Unit, Clare puts her own personal issues aside and tries to find out who is responsible for the death of the two patients.