This is *The Lions of Fifth Avenue by Fiona Davis* - a New York Times bestseller and a *Good Morning America Book Club Pick* (you can see the gold sticker on your cover).
Published *August 4, 2020* - Fiona Davis is famous for writing novels set in iconic New York City buildings.
Here is a summary in English:
The novel has two timelines, connected by a mystery of stolen rare books inside the iconic *New York Public Library* on Fifth Avenue (the one with the two lion statues, Patience and Fortitude, at the entrance).
*1913 - Laura Lyons:*
On the surface, Laura has a fairy-tale life. Her husband *Jack Lyons* is the superintendent of the New York Public Library, and because of that job, the family actually gets to *live inside the library* - in a 7-room apartment hidden on the mezzanine level.
They have two small children. But headstrong Laura is bored and restless being just a wife and mother. She secretly applies to the *Columbia School of Journalism* - one of the first women to do so.