The book was written by Lukša under original title Partizanai už geležinės uždangos (Partisans Behind the Iron Curtain) during his stay in Paris in 1948–1950.

It is based on memories of Lukša and documents of the Lithuanian partisans and describes the first three years of the Soviet occupation (1944–1947).

Lukša describes hard life of the partisans, the Soviet terror on Lithuanian people, and the crossing the Iron Curtain at the end of 1947 to the West.

He along with fellow partisans Jurgis Krikščiūnas–Rimvydas and Kazimieras Pyplys–Mažytis crossed through the Iron Curtain as messengers to the West in hopes to attract support for the fighters and to establish contacts with Lithuanians in exile.

They carried information collected by partisans about Soviet repressions, killings and deportations, also a letter to Pope Pius XII explaining the situation in occupied Lithuania and asking for support for struggling nation.