 Jeanne is furious that all aunt Odette left her Jeff in her last will is a measly  organ  (actually an expensive harmonium), and even considers having the will contested in court by Ria, who needs the money to pay Jo for a portrait in legal toga at the law firm where she s starting a cadet-ship. Augustine  Gust  Vleerackers, Koen s granddad ( Opa  in Dutch, hence the title), was put on the bus on senior pilgrimage to Lourdes, but jumped off in Leuven, and now wants to sleep a few nights with his grandson, without Jeanne knowing as she would inform his daughter. Yet his nightly wondering makes Jeanne believe maybe Odette is haunting the house but may be appeased...