Regarded as the first full-length locked room mystery, The Big Bow Mystery focuses on a murder that has occurred inside a locked room, with no clear indication as to the weapon used, the perpetrator of the horrendous crime, or a possible escape route. Scotland Yard is stumped. Yet the seemingly unsolvable case has, as Inspector Grodman says, ""one sublimely simple solution"" that is revealed in a final chapter full of revelations and a shocking denouement. The Big Bow Mystery has been almost continuously in print since 1891 and has been used as the basis for three commercial films.