Siren of Depravity

Harry Keyes hasn't seen his brother Dexter for over ten years, but during his daughter's seventh birthday party, he gets an unexpected call claiming that Dex has found something which may change their dysfunctional family forever.
Asking for Harry's help to locate his mother, what is Dexter trying to achieve? Is it anything to do with the dark experiments he'd practiced as a boy? And will it really involve terrible entities rumored to occupy different underground parts of the country?
So begins a chilling investigation into their childhoods, growing up in a rural village with a cruel father and possibly worse monsters. Harry learns about many terrible things, including kidnappings, torture, and attempts to summon undead creatures from the earth's ancient past.
And all that's needed to waken them is a siren...a siren of depravity.