"Getting a man from London to Edinburgh doesn’t sound as if it’s going to be a very difficult assignment for Janet and Edward Bennett, not even if the man is somewhat particular about how he gets from one place to another. They are surprised and not happy when the man in question invites his new girlfriend to come along on the journey.
As the assignment gets both more convoluted and increasingly dangerous, Janet starts to wonder if anyone can be trusted. Edward doesn’t wonder. He simply stops sharing their plans with everyone until he can make some plans of his own."