Dad hasn't even been dating his new girlfriend that long, so Ava is sure that nothing has to change in her life. That is, until the day after sixth grade ends, when Dad whisks her away on vacation to meet The Girlfriend and her daughter in terrifying Colorado, where even the squirrels can kill you! Managing her anxiety, avoiding altitude sickness, and surviving the mountains might take all of Ava's strength, but at least this trip will only last two weeks. Right?