This is a memoir, though the author said he was tempted to write it as fiction. He's the grandson of holocaust survivors from Poland. He never met his grandfather, but knows that his grandfather spent years trying to reclaim ownership of his family home. Kaiser takes up this effort and takes us through the Polish court system (he has to have his relatives officially declared dead, which proves more challenging than he imagined). He also meets people livibg in the building that he believes his family owned. Another story woven throughout is that of Polish treasure hunters who search a strange Nazi building project built by Jewish slave labor. He finds a family connection there as well and follows it. He talks about memory, and history, and genealogy, and property, and mythology in a way. I listened to the audiobook, read by the author, and really liked it.