Picture Tree Intl. has boarded international sales on “Last Call,” a real-time hostage thriller from Tanweer Productions , inspired by true events, and set to launch to international buyers ahead of the European Film Market, including market premiere screenings. The teaser debuts here. Directed by Greek-Egyptian filmmaker Sherif Francis, “Last Call” unfolds on New Year’s Eve 1999 in Athens, where a desperate fugitive armed with a live grenade takes a family hostage and demands to go live on