Olivia isn't the only one hunting for the missing children. A break in at her work redoubles her curiosity and a mysterious book may hold answers.

The search for the missing children continues when Olivia meets Wallace - is he an enemy or an ally? Could the legend of the Pied Piper be true?

When Olivia's best friend goes missing, she and Wallace team up to put together the pieces of the puzzle. Olivia realizes she can hear something no one else can - even without her hearing aids. Could it be the Piper's song?