A Penny too Many

You'd think Lady Chamberlain had cooked this scheme up of twisted family members, but not this time, Fuschia Eberhardt is the widow of the now deceased Captain Eberhardt, and she refuses to change her surname even though she is now married to another man. Its not until she finds herself being blackmailed by a mysterious letter writer that she enlists the help of Detective James Knight, but if you recall James' track record with female clients', then you'd be a little leary too!