Il mercante di pietre, internationally released as The Stone Merchant, is a 2006 Italian-British thriller film following Alceo, a disabled Roman university professor who lost his legs in a past terrorist attack, and his beautiful wife, Leda. While vacationing in Cappadocia, Turkey, the couple crosses paths with Ludovico Vicedomini, a charismatic gem merchant, and his enigmatic associate, Shahid. Unbeknownst to the couple, Ludovico is an Islamic convert secretly collaborating with an underground radical network to orchestrate a catastrophic, large-scale terrorist attack against Western Europe. The plot complicates significantly when Ludovico becomes deeply infatuated with Leda, leveraging his charm and gifting her an expensive ring to initiate a predatory, extramarital seduction behind Alceo's back. As Alceo grows intensely suspicious of the merchant's radical political leanings and the encroaching infidelity, the local counter-terrorism police dismiss his frantic warnings as mere paranoid marital jealousy, trapping the couple in a deadly game of betrayal and fundamentalist warfare.