The person stories published here are translated from the Hebrew book “Lifkoach et Ha’einayim” (“Open Your Eyes”) which was published in Tishrei 5767 (Autumn 2006).
The idea that a tzaddik, a Holy Jew, can appear in this physical world after his passing is not at all unheard of in Jewish tradition. There are stories of such events related in the Talmud about Rebbi Yehuda Hanasi (who after his passing visited his family on the eve of Shabbat) and in more recent times about the Baal Shem Tov (who appeared to the Alter Rebbe (first Rebbe of Lubavitch) when he was imprisoned by the Russian government).
Read these stories and judge for yourself.