Cécile is Dead (Maigret, #20)

Barely twenty-eight years old. But it would be difficult to look more like an old maid, to move less gracefully, no matter how hard she tried to be pleasing. Those black dresses ... that ridiculous green hat!

For six months the dowdy Cécile has been coming to the police station, desperate to convince them that someone has been breaking into her aunt's apartment. No one takes her seriously — until Maigret unearth a story of merciless, deep-rooted greed.