The Lost Daughter by Elena Ferrante

When her daughters leave home to be with their father in Canada, Leda anticipates a period of loneliness and longing. Instead, slightly embarrassed by the sensation, she feels liberated, as if her life has become lighter, easier.

She decides to take a holiday by the sea, in a small coastal town in southern Italy. But after a few days of calm and quiet, things begin to take a menacing turn. Leda encounters a family whose brash presence proves unsettling, at times even threatening.

When a small, apparently meaningless, event occurs, Leda is overwhelmed by memories of the difficult and unconventional choices she made as a mother and their consequences for herself and her family.
 
The seemingly serene tale of a woman’s pleasant rediscovery of herself soon becomes the story of a ferocious confrontation with an unsettled past.