Callsign: King II - Underworld: King II - Underworld: King - Book 2 - Underworld (a Jack Sigler - Chess Team Novella)

Set against the backdrop of the enigmatic Superstition Mountains, the story follows Jack Sigler, the leader of a covert team, as he investigates a military cover-up linked to a highway accident. Joined by archaeologist George Pierce and a paranormal investigator, they delve into the desert's mysteries while evading soldiers and a legendary hitman. As bizarre occurrences escalate, they must uncover the truth and avert a catastrophic conflict with the monstrous beings lurking beneath the surface.