Patricia Highsmith

Deep Water is a psychological thriller novel by Patricia Highsmith, first published in 1957 by Harper & Brothers. It is Highsmith's fifth published novel, the working title was The Dog in the Manger. It was brought back into print in the US in 2003 by W. W. Norton & Company.

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.