Having completed their training with the Texas Rangers, Isabella Donner and Rex Murphy are now fully licensed freelance operatives. With their mentor, Ranger Captain Dr. P.B. Hill, on assignment, they are sent to investigate a mysterious rash of suicides in Corpus Christi.
An interview with Corpus Christi PD Sgt Karl Evans reveals that the 10 victims have nothing in common – different ages, races, genders, jobs, schools. Evans notes that some family members reported the victims suffered nightmares shortly before ending their lives.
They speak to victim Jason Mallard's boss, Scott Smith, who confirms Jason had no reason to harm himself but had a horrible nightmare about the abandoned scrapyard near town. Victim Rachel Edwards' husband, Dustin, was able to confirm that she had the same nightmare, though Rex had to promise him that she was insured and that it would be enough of a payout to help support her beloved niece and nephew.
They snuck into the scrapyard and found several large ponds on the grounds teeming with hundreds of tiny, odd creatures that appeared to be a mix of leech and tadpole (Rex dubbed them leechpoles). They got the drop on two odd figures who appeared to have been human once but were now scaly and malformed. They overheard them talking about the imminent arrival of "the Great Lord" and were able to slay the creatures with judicious use of Rex's detonation cypher and Isabella's .45 and machete.
The two creatures were in possession of an ancient tome, which Isabella was able to decipher and learn that it was the source of a ritual the creatures were using to open a portal and summon an unknowable eldritch horror that should have been sleeping in R'lyeh. Fortunately, the tome told how to disrupt the portal – by throwing the tome and the head of one of the horror's minions through the portal. Isabella recovered one of the creatures' heads and Rex lashed it securely to the tome.
Further investigation led the intrepid duo to a large warehouse in the center of the yard. Inside, a woman in ornate robes and with the same disfigurements as the creatures outside was conducting a ritual in front of a portal to a hellish other dimension. A tentacled … thing … was on the other side, ready to come through to this reality … but Rex and Isabella would have none of that!
Isabella attacked the witch with cyphers and her trusty .45, while Rex charged in and caught a ride (albeit unintentionally) on a tentacle right up to the portal … taking a picture of himself with the portal in the background in the process! With a mighty heave, Rex lobbed the tome and head through the portal, and a few short moments later, the portal winked out of existence.
Meanwhile, Isabella had blasted the witch with a cypher and shot her a few times. The witch managed to ensorcel Rex and turn him against his partner … until the portal collapsed. With her master forever beyond her reach, the witch collapsed into a sobbing, unresponsive heap.
The duo tied her up and brought her to the police station, and left to recover and wonder what new adventures would lie in store in the strange new world!