"The Millstone Falls," the gripping fourth installment in Ken Decoteau's "Fallen Apples Series," plunges readers into a world where the lines between recovery and relentless conflict blur. Jason Richardson, Molly Turner, and Brian Deegan, elite security contractors, are still grappling with severe injuries from their last world-saving mission, but their fight is far from over. A shadowy organization, led by the elusive figurehead, has perfected a chilling new form of warfare: weaponizing personal data harvested from everyday applications to identify and eliminate targets with terrifying precision. When a powerful U.S. Senator falls victim to a sophisticated drone strike, Jason, now leading a specialized military unit despite his wheelchair, must unravel the conspiracy. Simultaneously, an RDI team led by the formidable Olivia Kuznetsov races across the Pacific to neutralize a mobile nuclear warhead factory. As these seasoned operators, bruised but unbowed, navigate a treacherous landscape of advanced espionage and relentless combat, they confront an enemy that sees everything. In a world where data is deadly, they are the last line of defense, ready to drop a millstone on those who exploit unseen vulnerabilities. Can they stop a global threat that's always listening?