There used to be a café called Mon Cheri at Nishi Waseda where members of the Waseda Mystery Club spent day after day frothing in excitement over the latest mystery novels...Her Grandfather had been a core member of the Club.Coffee always tasted better with a good old-fashioned mystery.As a lover of classic crime stories, it's perhaps no surprise that 27-year-old schoolteacher Kaede encounters everyday mysteries more often than your average person. Solving them is another matter though, and the person she always heads to for guidance is her beloved grandfather who, despite having dementia retains a keen sharpness of mind. From impossible locked room murders to confounding missing person cases, the granddaughter and grandfather team ?weave stories' in master-and-apprentice fashion to get to the bottom of a variety of cases. All the while, a shadow slowly closes in on Kaede, posing a more insidious threat...Steeped in references to classic crime from Christie to Chesterton to Poe, My Grandfather, the Master Detective playfully nods to forebears of the genre, while also carrying the light-hearted, escapist hallmarks of cosy crime books which have recently captured readers' imaginations. Meanwhile, its charming characters and affectionate focus on relationships bring to mind heart-warming Japanese titles such as Before the Coffee Gets Cold.