Dangerous Times Series by Robin Parrish

The return of NASA's first manned mission to Mars was supposed to be a momentous day. But when the crew loses touch with ground control before entry, things look bleak. Safe after a treacherous landing, the crew emerges to discover the unthinkable--every man, woman, child, and animal has vanished without a trace. Alone now on their home planet, the crew sets out to discover where everyone has gone--and how to get them back--only to discover they may not be as alone as they thought.

Ghost Town is the hottest amusement park in the country, offering state-of-the-art chills and thrills involving the paranormal. The park's main ride is a haunted mansion that promises an encounter with a real ghost. When Maia Peters visits during her senior year of college, she's not expecting to be impressed. Maia grew up as the only child of a pair of world-renowned "ghost hunters," so the paranormal is nothing new. In fact, the ride feels pretty boring until the very end... moreGhost Town is the hottest amusement park in the country, offering state-of-the-art chills and thrills involving the paranormal. The park's main ride is a haunted mansion that promises an encounter with a real ghost. When Maia Peters visits during her senior year of college, she's not expecting to be impressed. Maia grew up as the only child of a pair of world-renowned "ghost hunters," so the paranormal is nothing new. In fact, the ride feels pretty boring until the very end. There, a face appears from the mist. The face of Jordin Cole, a girl who disappeared from campus a year ago. Convinced what she saw wasn't a hoax and desperate to find answers to Jordin's disappearance, Maia launches into a quest for answers. Joined by Jordin's boyfriend--a pastor's kid with very different ideas about the spirit realm--Maia finds herself in a struggle against forces she never expected to confront. less

Nolan Gray is an elite soldier, skilled in all forms of combat. After years fighting on foreign battlefields, witnessing unspeakable evils and atrocities firsthand, a world-weary Nolan returns home to find it just as corrupt as the war zones. Everywhere he looks, there's pain and cruelty. Society is being destroyed by wicked men who don't care who they make suffer or destroy.Nolan decides to do what no one else can, what no one has ever attempted. He will defend the helpless... moreNolan Gray is an elite soldier, skilled in all forms of combat. After years fighting on foreign battlefields, witnessing unspeakable evils and atrocities firsthand, a world-weary Nolan returns home to find it just as corrupt as the war zones. Everywhere he looks, there's pain and cruelty. Society is being destroyed by wicked men who don't care who they make suffer or destroy.Nolan decides to do what no one else can, what no one has ever attempted. He will defend the helpless. He will tear down the wicked. He will wage a one-man war on the heart of man, and he won't stop until the world is the way it should be.The wicked have had their day. Morality's time has come. In a culture starving for a hero, can one extraordinary man make things right? less