When I was young (born 1947) in Canada, I know of "DPs" (Displaced Persons), but I knew nothing. Joe Vitovec has given us an insightful picture of how this happened to a Czech teen through Nazi occupation, then Communist rule. The story of his next decades will keep you reading through the night.
This is an excellent presentation of how things went for many people. You all know some of them. Now you will understand them better.