The Winking Ruby Mystery

This is an Apple Books audiobook narrated by a digital voice based on a human narrator.
In Europe, the sisters discover that Gino's family has disappeared, driven into hiding by blackmail and threats of mal occhio, the evil eye. Probing deeper into the strange riddle, Jean and Louise become enmeshed in a mystery more frightening than the dungeon in which they are imprisoned. How they extricate themselves and locate a fabulous crimson gem make a pulse-quickening story.