"Downfall" is book #1 in the Systemic series. Something terrible is breeding in the mountains of northwest China…a virus so infectious, its symptoms so overwhelming that its mortality rate is almost absolute. The “Su flu” as it eventually becomes known, quickly ravages the body of its host, killing it within just days, and worse yet, it’s gone airborne. Just weeks after making its appearance on the world stage – the earth’s population held as its captive audience – the virus has taken that stage and annihilated nearly all its spectators. Writer and stay-at-home dad John Stevens never considered himself a “prepper” like the ones he’d seen on television. Just a regular guy, married to a regular girl, with a wonderful two-year-old son, life in the suburbs of Chicago is good, and John and his family are living the American dream…that is, until the Su flu strikes. With mankind suddenly gripped by the worst pandemic in history, will the foresight that led John to prepare some emergency supplies and an evacuation plan be enough for him and his family to survive not just this deadly virus but the chaos that ensues? Or will they succumb to the renegade lawlessness that has turned much of humanity’s remnants into a vicious, scavenging, do-anything-to-survive populace? As John and his family search for some semblance of the world they once knew, they’ll discover just what they’re willing to do to survive in a grueling post-pandemic world.

"Quest" is book #2 in the Systemic series. The “Su flu” virus swept its way around the globe in a matter of weeks, decimating the world’s population and laying waste to modern civilization. Surviving the flu was just the beginning of the struggle for John Stevens and his family. After a vicious and unprovoked attack by rogue mercenaries forced them to abandon their camp deep within the forests of southern Illinois, they find themselves thrust in a vastly different world from the one they once knew. Now John and his group must struggle not only to find a place to call home, but learn how to survive in a landscape that no longer knows the comforts of modern amenities. Life has been reset to the 1800s, and John must quickly adapt in order to lead and protect his family in this challenging new environment. But not everyone who survived the flu is content to keep to themselves, and as John and his family will soon discover, outsiders are watching…waiting…and wanting what they have.

“Descent” is book #3 in the Systemic series. It’s been nearly six months since the deadliest pandemic the planet has ever known decimated the world’s population. John Stevens has discovered that it’s not the virus that has proved most dangerous to him and his family though, but the people it left behind. Having escaped the Chicagoland area only to be pushed farther south by the territorial demands of other survivors, John and his family are desperate to find some semblance of the world they once knew. So when they stumble across a small farm in rural Georgia, inhabited by a contentedly quiet farmer and his welcoming wife, they are pleasantly surprised to learn that not everyone left on the planet has become lawless renegades. But not all is as it seems at this peaceful homestead. Oh, and by the way; guess who else is back? Yep…Jake and Ava. They’re on the prowl, and like John and his family, looking for a place to settle down, but with much different intentions in mind. About the Author: K.W. Callahan left his role in the hospitality industry to pursue a career in writing. Since then, he has written books on a variety of subjects as well as penned articles for numerous print and online publications. Before his work on the Systemic series, K.W. authored several other novels that include: The M.O.D Files: The Guest Who Stayed Over, a murder mystery set within the confines of a landmark Chicago hotel, and Palos Heights, a suspense thriller that follows four college students on a weekend bike trip that takes a dark and deadly turn.

“Forsaken” is book #4 in the Systemic series. It’s been a long and arduous journey since John Stevens rallied his family together in the remote forests of southern Illinois in an effort to shelter them from the most devastating pandemic in history. Now they’ve finally discovered a secluded spot in the abandoned town of Olsten, Georgia where they finally feel safe from the dangers of the outside world. But are they? While John and his family look for solace from the Su flu’s aftermath, Jake Stines and Ava Acadro are searching for anything but isolation. They’re looking to make their way – no, force their way – into a world that fits them perfectly – no rules, no laws, no mercy. Willing to take what they want or die trying, the two are setting up shop in the wilds of the Atlanta metro area. But will their combination of brawn and brains be enough to solidify their presence in the city? About the Author: K.W. Callahan left his role in the hospitality industry to pursue a career in writing. Since then, he has written books on a variety of subjects as well as penned articles for numerous print and online publications. Before his work on the Systemic series, K.W. authored several other novels that include: The M.O.D Files: The Guest Who Stayed Over, a murder mystery set within the confines of a landmark Chicago hotel, and Palos Heights, a suspense thriller that follows four college students on a weekend bike trip that takes a dark and deadly turn.

(Aftermath is a stand-alone, three-part series picking up where the Systemic series left off)John Stevens and his family have finally found the perfect place to hold out until the chaos that followed the Su flu pandemic blows over. But even the tropical isle they’ve selected, nestled in the balmy warmth of the Caribbean, isn't turning out to be the safe haven they thought it’d be. Meanwhile, Ava Acadro, the power-hungry governor of Miami is fighting to take Fort Lauderdale while control for her home city is being challenged by those within her own ranks. Will she be able to sack the city to the north and consolidate her power? Will she be able to rein in her minions and maintain her hold over Miami? Or will the city descend into the chaos it was experiencing when she first arrived? The gripping Systemic Series saga continues as the struggle to survive in and rebuild the post-pandemic world rages on.

(Aftermath is a stand-alone followup to the Systemic series) John Stevens and his family have finally found the perfect place to hold out until the chaos that followed the Su flu pandemic blows over. But even the tropical isle they’ve selected, nestled in the balmy warmth of the Caribbean, isn't turning out to be the safe haven they thought it’d be. Meanwhile, Ava Acadro, the power-hungry governor of Miami is fighting to take Fort Lauderdale while control for her home city is being challenged by those within her own ranks. Will she be able to sack the city to her north and consolidate her power? Will she be able to rein in her minions and maintain her hold over Miami? Or will the city descend into the chaos it was experiencing when she first arrived? The gripping Systemic Series saga continues as the struggle to survive in and rebuild the post-pandemic world rages on.