So Charlotte is tied up, covered with a blanket, lowered out of a window and taken away in a carriage with "Nick", the rather dishy man she followed into the room.
He explains that he's trying to uncover a spy who caused a lot of deaths in Afghanistan and that he's working for the government - Charlotte doesn't think she can believe him.
And thus the book turns into "Stockholm Syndrome on the A1" as they travel northwards by carriage chasing after the mystery spy woman, Julia Reed. As her captivity continues Charlotte starts to trust Nick her captor and ends up helping him.
He also does his part in helping her - helping her to get over the bad ways in which her husband treated her, mainly in bed; guess how Nick helps her with THAT problem?