The House in Paris — Elizabeth Bowen

When eleven-year-old Henrietta arrives at the Fishers' well-appointed house in Paris, she is prepared to spend her day between trains looked after by an old friend of her grandmother's. Little does Henrietta know what fascinations the Fisher house itself containsâ€"along with secrets that have the potential to topple a marriage and redeem the life of a peculiar young boy. By the time Henrietta leaves the house that evening, she is in possession of the kind of grave knowledge that is usually reserved only for adults.