The town blames an ancient "siren" legend, but Callum discovers a disturbing truth: Dr. Lydia Heller, a scientist presumed dead in a mine collapse seventeen years ago, has been conducting illegal sound-frequency experiments that manipulate grief-stricken people. Working with his childhood friend and former love Naomi Blackwood, Callum learns the victims were all children of miners who participated in "Project Resonance," a classified acoustic mining technology that evolved into mind control research. After tracking Heller to an abandoned company facility, they confront her and rescue the six living victims. The revelation that the supernatural "Siren" was actually human experimentation forces the town to confront corporate exploitation and scientific abuse. As federal investigations continue, Callum decides to stay in Hollow Creek, working with the sheriff's department while reconnecting with Naomi.