This second box set in Mary Stone's heart-pounding Ellie Kline Series contains the fourth, fifth and sixth thrillers in the series: Cold Highway, Cold Grave, Cold Shadows.Cold Highway: Dr. Kingsley, or The Master, the man who kidnapped Detective Ellie Kline when she was fifteen, is in the wind. But if he's incapacitated and on the FBI's Most Wanted list, has someone taken his place? Lucky's playground is America's cold highways, taking his power from women with the kill. Partnered with FBI Special Agent Clay Lockwood to crack open a case as horrifying as the human trafficking ring, all signs point to a new master, or mistress, of a terror that went under with the master. When someone very close to Ellie is taken, the hunt turns personal once again, and Ellie is determined more than ever to bring this ring of terror down. But sometimes the prey eats the predator...Cold Grave: Every death tied to Tucker Penland, who hunted his prey and left behind a horrific mystery, raises more questions than answers, and Detective Ellie Kline must piece together clues to help identify a dozen victims. Their families need closure. So does she. But she can't escape the feeling that Dr. Kingsley is still out there, waiting to strike. But what can she do? Her kidnapping case was taken out of her hands, and the new detective wastes no time pointing a finger in her direction. Worse, her colleagues believe she's obsessed with a ghost. When a threatening package arrives on her doorstep, a call to FBI Agent Clay Lockwood leads to a startling revelation. No one is safe. Not even one of their own. Evil doesn't always stay in its grave...Cold Shadows: Katarina, The Master's protege, is making a comeback one mark at a time, but she's losing her razor-sharp edge. Seeking revenge, she's making bloody mistakes that just might cost her the one desire of her heart. When Dr. Kingsley surfaces, Detective Ellie Kline and Special Agent Clay Lockwood track him to Florida where each horrifying clue adds a new whirl to the circle of evil that's growing wider. Now, it's circling back on itself. When Ellie was a beat cop, she saved a child from Katarina's clutches. Little Harmony is missing again, and a secret is being exposed one terrible illegal adoption at a time. The circle's evil fingers are wrapping tighter around Harmony. It's a race to the rescue with the life of an innocent child at stake, and hundreds more. The deadliest monsters live outside the shadows...A blood-pumping chase to stop a monster turns high stakes in the Ellie Kline Series. Before you begin reading...count your knives.