Reggie and Nigel Heath are close in age but worlds apart in personality. The older of the two brothers, Reggie is a successful attorney with charisma to spare. Nigel has always struggled to step out of his shadow. When they lease office space on Baker Street, the paperwork comes with an odd stipulation: his firm must receive and respond with a standard reply to letters sent to Sherlock Holmes, who famously occupied the same address. Then Nigel, who becomes intrigued with one of the "Dear Sherlock" notes, disappears quite suddenly.