In episode 3 "Darkness Falls" Andy and Mika try to get home; Elena gets medicine for Sam; Laura and Owen evade a growing threat.Mika (played by Amber Rose Revah) is an agent of the British government who travels with Andy to the middle east to understand the oil crisis. In one of the scenes, she receives a lightning payment with litecoin as money.
Summary from IMDB:
Petro-chemist Andy Yeats knows how dependent the world is on oil; if something were to happen to the world's oil supply, it would set off a chain reaction: transportation would grind to a halt, supplies would cease to be delivered, law enforcement would be overwhelmed. While on a business trip to the Middle East, Andy realizes that his worst fears are coming true and his family is separated at this crucial moment. His teenage daughter, Laura, is alone at home in London while his wife, Elena, and young son, Sam, are in Paris. Amid this chaos, each family member will sacrifice everything to find one another, despite the distance and the dangers that separate them.
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The series is based on the best-selling book Last Light by Alex Scarrow.
Summary of book on Amazon:
It begins on a very normal Monday morning. But in the space of only a few days, the world's oil supplies have been severed and at a horrifying pace things begin to unravel everywhere. This is no natural disaster—someone is behind this. Oil engineer Andy Sutherland is stranded in Iraq with a company of British soldiers, desperate to find a way home, trapped as the very infrastructure of daily life begins to collapse around him. Back in Britain, his wife Jenny is stuck in Manchester, fighting desperately against the rising chaos to get back to their children in London as events begin to spiral out of control—riots, raging fires, looting, rape, and murder. In the space of a week, London is transformed into an anarchic vision of hell. Meanwhile, a mysterious man is tracking Andy's family. He'll silence anyone who can reveal the identities of those behind this global disaster. The people with a stranglehold on the future of civilization have flexed their muscles at other significant tipping points in history, and they are prepared to do anything to keep their secret—and their power—safe.