The Ghost Frequency - a pulse at the edge of hearing - grips you from the first page. In a secretive DARPA lab, neuroscientist Dr. Catherine Whitmore watches in shock as Subject Zero; a man whose memories have been erased; whispers her name from inside a locked-down experiment. No one can explain how he knows her... unless it's the elusive signal thrumming through the facility's speakers, a signal code-named the Ghost Frequency, which shouldn't exist at all.Catherine's classified Project SIREN was meant to map the subconscious mind through sound, not unleash it. Yet the "Ghost Frequency" she has isolated is interacting with Subject Zero in impossible ways. John Harrison Blake, once a covert intelligence operative, has nothing left of his past but an empty file; until this inaudible frequency awakens fragments of the life he lost. Under its eerie hum, Catherine and John begin to share visions and visceral memories that don't belong to either of them. It's as if the signal has entwined their minds, blurring the line between reality and hallucination, science and the supernatural.As their connection deepens, so do the dangers. Catherine's rational world is upended by chilling experiences she can't explain, and John is haunted by emotions that aren't his. Both are pawns in a high-stakes experiment spiraling out of control. The same forces that brought them together now see their bond as a threat; and a key to wielding a terrifying power. Racing against time, Catherine and John must trust each other to confront what lies at the end of the Ghost Frequency... before it claims them both.And here's the part that will send a shiver down your spine: DARPA is real - a U.S. government agency that truly exists to develop advanced defense technologies - and the Ghost Frequency is real too. Infrasound around 18.9 Hz has been documented to induce fear, hallucinations, and even the eerie sensation of being watched. The Ghost Frequency is fiction, but it's built on real phenomena - a smart, pulse-pounding thriller that shows how sometimes fiction only looks like fiction... and sometimes, it's a warning.