MJ Franklin, who hosts the Book Review podcast’s monthly book club, says that whenever someone asks him, “What should I read next?,” Yael van der Wouden’s “The Safekeep” has become his go-to recommendation. So he was particularly excited to discuss the novel on this week’s episode. Set in the Netherlands in 1961, “The Safekeep” is one of those books it’s best not to know too much about, as part of its delight is discovering its secrets unspoiled.