Dr. Watson, having returned to London after serving in the Second Anglo-Afghan War, visits the Criterion Restaurant and runs into an old friend named Stamford. Watson confides in Stamford that, due to a shoulder injury that he sustained at the Battle of Maiwand, he has been forced to leave the armed services and is now looking for a place to live. Stamford mentions that an acquaintance of his, Sherlock Holmes, is looking for someone to split the rent at a flat at 221B Baker Street, but he cautions Watson about Holmes's eccentricities.