A new Susanna Clarke novel?

Oh yes.. yes indeed:

https://www.bloomsbury.com/uk/superpage/piranesi-by-susanna-clarke/

Piranesi has always lived in the House. It has hundreds if not thousands of rooms and corridors, imprisoning an ocean. A watery labyrinth. Once in a while he sees his friend, The Other, who needs Piranesi for his scientific research into A Great and Secret Knowledge. Piranesi records his findings in his journal. Then messages begin to appear; all is not what it seems. A terrible truth unravels as evidence emerges of another person and perhaps even another world outside the House’s walls. 

Bloomsbury – just take my money already! Way beyond hyped for this.