Annika is invited to perform at a concert in Cremona, the hometown of legendary violin maker Antonio Stradivari. Four exquisite Stradivari instruments are showcased in the concert hall. But during the performance, a sudden blackout plunges the venue into chaos. When the lights come back on, a shocking discovery is made — one of the priceless violins has vanished. Annika becomes a prime suspect, but she’s determined to clear her name and assist the Commissario in uncovering the truth.