In what year does this book take place?

Nuri and Afra were born and raised in Syria. The civil war began in 2011. At the outset of the Syrian Civil War, they reside in Aleppo, which is one of the country’s largest and most populous cities. The violence of the war eventually devastates Aleppo and other regions of the country. After Nuri and Afra’s son Sami is killed by a bomb, Nuri and Afra decide to flee the country. Mustafa and his family have already fled the country by that point. Nuri and Afra hope to reunite with Mustafa in England.