A Sherlock Holmes double bill, with Jeremy Brett playing the lead. In 'The Man with the Twisted Lip' the master sleuth is asked by a distraught woman to find her missing businessman husband, Neville St Clair, and is drawn into the underworld of opium dens. Whilst in 'The Six Napoleons' someone is breaking into houses and destroying busts of Napoleon Bonaparte. Horace Harker hears his bust being smashed and, in his pursuit of the perpetrator, he discovers a body; so Holmes is brought in to investigate.