His Last Bow by Sir Arthur Conan Doyle is a Sherlock Holmes story set during World War I, where the famous detective is called out of retirement to help with a crucial mission. Holmes, now living in a quiet country life, is approached by his old friend Dr. Watson to track down a German spy who is plotting against Britain. The story sees Holmes use his brilliant mind one last time, as he outsmarts the enemy and ensures that vital information is kept safe. The tale wraps up with a sense of closure, as Holmes's career comes full circle in this final, heroic act.