Given a back-room computer job when the beloved Birmingham library she works in turns into a downsized retail complex, Nina misses her old role terribly - dealing with people, greeting her regulars, making sure everyone gets the right books for their needs. Then a new business nobody else wants catches her eye: owning a tiny little bookshop bus up in the Scottish highlands. No computers. Shortages. Out all hours in the freezing cold; driving with a tiny stock of books ... not to mention how the little community is going to take to her, particularly when she stalls the bus on a level crossing ...