Penelope, known as Lo, always liked collecting beautiful objects. Her father's work as a consultant kept her moving from one decadent city to another, where she became accustomed to picking up (sometimes even stealing) peculiar jewelry and memories from each new place. She looked for goods that would allow her to feel, at least, some semblance of home. But, since his brother Oren's death, their family has never been the same: their father is more in the office than at home, their mother lives doped with antidepressant medications, and Lo's mania has become a potentially dangerous obsession. During her routine scouring flea markets, she discovers a beautiful antique pendant and recognizes it as stolen. It belonged to a murdered girl known only as "Sapphire" who was just a few years older than Lo. With the help of the street artist Flynt, she leaves in search of the killer, opening an investigation to unravel this enigma.