In Berlin in 1989, the Cold War seems to be coming to an end but thirteen-year-old Liesl still feels trapped behind a wall as she tries to uncover a secret about her American grandfather, aided by a boy whose father is in the United States Air Force.
In 1961, thirteen-year-old Sabine, an adventurer despite being crippled by polio, finds a forgotten bunker which might allow her, her family, and friends to reach freedom by tunneling under the Berlin Wall, or might lead to far greater danger.
In 1948 Berlin, Germany, while trying to survive the Russian blockade of the city and also grieving for his father and sister who were killed in the war, thirteen-year-old Erich is befriended by a United States airman.
