派翠西亚·海史密斯

As Edith Howland's life becomes harsh, her diary entries only become brighter and brighter. She invents a happy life. As she knits for imaginary grandchildren, the real world recedes. Her descent into madness is subtle, appalling, and entirely believable.

This Sweet Sickness is a psychological thriller novel by Patricia Highsmith, about an insane young man who is obsessed with his ex-lover.