For eighty-five-year-old Paulette, the plan seemed perfect: to play the role of an old woman who goes mad—and force her son to pay for her stay at a luxurious boarding house on the French Riviera. But instead, he unexpectedly sends her to an inconspicuous nursing home hidden in the outskirts of Paris. The new resident has only one thing on her mind: to get out of this hole as soon as possible. No one expected that a seemingly harmless old woman would disturb the peace of an exemplary institution. Her curiosity makes her interfere in the lives of the home’s residents—none of the secrets can escape her inquisitive mind. What do the mysterious letters found in Monsieur Georges’s room contain? And who wrote the strange notebook found in the library? One thing is certain: these investigations will somehow change the fates of the heroes—and of Paulette herself.