After stealing some very valuable diamonds, the League of Pensioners need to get out of Stockholm.  They decide to lie low in a small town in the middle of nowhere.  However they quickly realise that like many other rural towns, Hemmavid is slowly dying and the five doughty pensioners decide to save the town.  Although how they are going to do that when they are wanted criminals is a bit of a problem.
Not having read the previous installments I came to this book completely cold but it made no difference.  The plot is suitable picaresque and fun, the characters amusing and the whole is just delightful!