With her passion for helping people, piano tuner Isabel Woods loves her job—but passion can be a dangerous thing. Reluctantly agreeing to harbor a client’s autistic daughter, Izzy’s good intentions unexpectedly expose her own family to a murderous fiend with a chilling agenda. Human trafficking and bio-terrorism are no longer just buzz words from the nightly news. For Izzy, they have become terrifying and real. As the deadly Sundrop Sonata begins to play, Izzy has one chance to save the people and the country she loves armed with nothing more than courage, intelligence, and her esoteric knowledge of pianos.