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.