After an absence of a number of years, some very popular mystery characters are making their return to the scene of the crime. There are many and varied reasons for an author to stop writing a series. Sometimes, they feel the series has run its course. Often they are focusing on developing a new series, or they may be writing stand-alone fiction. In one case, Ian Rankin was forced to end his Inspector Rebus series because the fictional character had reached the actual mandatory age of retirement in Scotland. Sue Grafton is often asked what will happen to Kinsey Milhone when she reaches the end of the alphabet series.