Komtuurin Surma by Haruki Murakami

In this enigmatic and introspective novel, a portrait painter grapples with the complexities of identity and creativity after a personal crisis leads him to a secluded mountain home. There, he discovers a mysterious painting hidden in the attic, which sets off a series of surreal events that blur the lines between reality and imagination. As he delves deeper into the painting's origins, he encounters a cast of intriguing characters and uncovers secrets that challenge his understanding of art, love, and the human condition.