First thoughts - Yellow Wallpaper/ Ottessa Moshfegh / Lara Williams (Supper Club)/ Annihilation (Jeff VanderMeer) / Kafka's Metamorphosis / What Ever Happened to Baby Jane?
The book is hallucinatory, disconcerting, playing with "what is madness"
The opening line
"I would be lying if I said my mother's misery has never given me pleasure."

Echoing Albert Camus's The Stranger: "Mother died today. Or maybe yesterday, I don't know."

Immensely readable and enjoyable psychodrama