The Boscombe Valley mystery

Watson receives a telegram from Holmes, inviting him to join for a case outside London, in Hereford shire. Mary supports the idea, so John meets his friend a few hours later. While they travel, Holmes reads the newspapers about the case: a young man, James Mc Carthy, found is father dead. They had been seen having an argument a little sooner. Everything seems to point to the son's guilt, but Holmes has a doubt.