Part historical fiction, part broken/ rebuilding romance, and part thriller, this is a great read about a girl whose father has a mental illness that has stressed and frustrated her most of her life. When he disappears instead of going to work the one job he's performed every summer, she begins to worry. The only person she can trust to help her figure out what's going on thanks to a mysterious display of maps and post-it noted on the wall at her father's home, is the guy who dumped her the year before.
It turns out Dad has gone to climb a peak, allegedly the only one a famous hiker/climber never summited in their part of the country. If Cara is going to find her father, she needs Nat's help. Their detective work is blended with entries from a diary beginning just before World War Two that gradually reveal part of the mystery that has her father trying to summit the peak. The author's knowledge of technical climbing, the gradual revelations about what happened many years ago, and the way Cara and Nat slowly open back up to each other are combined to create a real page turner that subtly opens readers' eyes to how devastating the internment of Japanese Americans was during the war. Terrific read all the way around. ( )