An unnamed wife shares her exploits in a series of letters to her husband. The encounters described include fantasy scenes, swinging antics, and many dalliances with men and women carried out with her husband's ultimate satisfaction foremost. The letters feature graphic language and explicit bisexual erotic content, including same sex pairing, ménage, stranger sex, group sex, anal penetration (m/m m/f), and other scenes which may cause offense.

Matthew Fletcher and Eleanor Grant meet at a Royal Air Force base dance, where Matthew recognises Eleanor's potential as a willing submissive and as someone who has the passion to match his love of harsh erotic discipline. They explore each other through a series of erotic games that help stimulate her desire for submission, spanking and other pleasures, which she shares through her diaries. As their relationship develops, Matthew revisits his past and reveals his early sexual learning with an older woman, which triggers an awakening that shapes his future with Eleanor.