When Rennie's dad, the Major, goes overseas on assignment, he enlists his mother-in-law to babysit Rennie. Babysit! A guy who's about to turn fifteen! But Grandma is no surrogate drill sergeant. She has fun on her mind. That means ditching school and heading to avalanche country for a surprise ski trip. Nothing can ruin Rennie's vacation, not the lodge owner, who turns out to be Grandma's geriatric long-ago boyfriend, not the annoying backcountry guide or the crooked park ranger or the pushy businessman from Mumbai, not even the explosions. And definitely not the most beautiful girl in the world, whom he meets while stumbling onto a murder plot. In this hair-raising prequel to Close to the Heel and From the Dead, the loyal, smart and observant Rennie heads to avalanche country.

No one is more surprised than Rennie to hear that his late grandfather, whom he hardly knew, has left a mission for him to fulfill. Rennie is to fly to Iceland and deliver a message from beyond the grave, but when he gets there, nothing is simple or straightforward. For one thing, Brynja, the teenage daughter of the family he's staying with, is downright hostile. Her father Einar, who is to be Rennie's guide in Iceland, is preoccupied with looking after his elderly father-in-law, an old friend of Rennie's grandfather. Bored and a little bit annoyed, Rennie explores the town and becomes aware that the family is dealing with more than their grief over Brynja's mother's death the year before. Before he realizes what is happening, his curiosity puts Rennie in grave danger, with no one to trust and no one to save him except himself. Rennie's adventures start in Slide, part of The Seven Prequels and continue in From the Dead, part of The Seven Sequels.

Rennie is in Uruguay when his cousins discover a secret cache at their dead grandfather's cottage. Thousands of dollars in foreign currencies. A mystifying notebook. Multiple passports, some obviously fake. A gun. A disguise. And a photo of some Nazis. Rennie's mission: to find out whether there was more to the old man than anyone knew. Was he a spy? If he was, what did he do? And for whom? Did he help a Nazi war criminal escape justice? Rennie's quest leads him to Argentina and then to Detroit, where he finds more questions than answers and more than one gun pointed—and fired—in his direction.