The Eye in the Door by Pat Barker

This book continues the stories of Dr. Rivers and some of his patients, especially Billy Prior, during World War I. Billy is put in the position of choosing between his government job and the family of the woman who raised him, a woman suspected of plotting to assassinate Lloyd George. Billy's position is all the more complicated due to periods of missing time where he doesn't remember his actions. This book continues Barker's explorations of the psychic wounds of World War I.