Doubt (Among Us Trilogy book 1

Harry Doubt, a genius programmer and creator of the popular online game 'Truth Seekers', has a personal mission of his own; to find his mother who went mysteriously missing while volunteering on a peacekeeping mission in Palestine. His gaming friends and followers inadvertently join in helping him find her; believing that they are on missions to find out what has happened to their own missing loved ones. During Harry's missions, Cristal and the team of 'Truth Seekers' stumble upon things that make them doubt the reality of their own lives. As they get closer to the truth, they realize that there are spiritual forces among them both good and evil, but in learning this, they activate a chain of events that start the beginning of the 'end of the world' as they know it.