In the sleepy coastal town of Mist Haven, Detective Sarah Hawthorne's world is turned upside down when she investigates the mysterious death of Elizabeth Blackwood, last scion of the town's most influential family. What begins as a routine case quickly spirals into a dark conspiracy spanning generations, as Sarah uncovers the existence of a secret society known as the Order of the Eternal Serpent.

As she delves deeper into the mystery, Sarah is shocked to discover her own connection to the Blackwood legacy and the Order's sinister plot. With the help of her partner Chen, her grandfather James, and a mother she thought long dead, Sarah races against time to stop the Order from unleashing an elixir that could enslave humanity.