The Last Puzzle Piece

Because Genko Ganev's parents chose not to join the Communist Party in Bulgaria, they were prohibited from the smallest hope of advancement for themselves or their only son. In fact, they "etched in his brain" the suggestion that he flee Bulgaria, even though they might never see him again if he succeeded and decidedly would not if he failed.

With determination, intelligence, and courage, and with his adopted Christian faith to guide him, Genko defied the Communist law against...
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Because Genko Ganev's parents chose not to join the Communist Party in Bulgaria, they were prohibited from the smallest hope of advancement for themselves or their only son. In fact, they "etched in his brain" the suggestion that he flee Bulgaria, even though they might never see him again if he succeeded and decidedly would not if he failed.

With determination, intelligence, and courage, and with his adopted Christian faith to guide him, Genko defied the Communist law against leaving the country. The adventures that followed rival in intensity the nerve-wracking scenes of an Alfred Hitchcock movie.

There is also a puzzle here. Plagued by recurring dreams that would not give him peace, Genko returned to Bulgaria to solve the puzzle. Then in a mystical dream, he found the clue that enabled him to "click in" The Last Puzzle Piece.