In 1947 the mr. Holmes has already left behind his best years. Now, at age 93, she lives quietly and retired on a farm in Sussex with a housekeeper and her son, who are in charge of taking care of him.
At that age his faculties, both physical and mental, are greatly diminished, which is a pity in a man like him who has had a prodigious mind. So, spend the day fighting this loss of power.
For this he takes care of his hives, which allows him to do a little exercise and also writes a diary, which serves him to remember, exercise his memory and leave his experiences written on paper for generations to come.
Suddenly, a very strange case is presented, so they will look for it to help, something that is not denied even though it does not happen at its best.