A Night Divided by Jennifer A. Nielsen (2018, A Book With the Time of Day in the Title)
"Family and social tension set during the dark and dangerous Cold War, right as the Berlin Wall is built, dividing the city, and the protagonist's family is split by the wall overnight, with part in the West and part in the East. Each chapter is tense — neighbors spy on neighbors, dissenters disappear in trucks, apartments are bugged. Her family must find the courage to survive and somehow make it to the West . . . but with the Wall in the way, will they ever be reunited?" — Chrissi
Here they are, for reference: 2015, 2016, 2017, 2018.