The Disappearance of Margaret Astor

An atmospheric English detective story set in England with two timelines and family secrets.
After the death of her grandmother, the famous artist Margaret Astor, Bella unexpectedly inherits a luxurious apartment in the center of London, of which no one knew. It turns out that in 1936, Margaret suddenly moved out, leaving all her valuable belongings in the apartment, and since then no one has entered.
Bella dreams of a successful career and a life of comfort, but what if the inheritance is not the fulfillment of her dream? Family secrets can prove to be quite sinister. What really happened to Margaret Astor over half a century ago?