Library Altitude Zero: When airline pilot and part-time piano teacher Ian Crawford is ordered to take a week off work, a question comes back to haunt him. Why did his wife Barbara ask him for a divorce? With time on his hands he battles with his anger towards his boss Geoff and his need to know. His wandering takes him to a local library where another mystery emerges. Together with barmaid Evelyn-Jane, fellow pilots Paul and Roddy and Frank the vicar, is drawn deeper in search of answers until finally he has to make a choice.