When Amy E. Wallen's southern, blue-collar, peripatetic family was transferred from Ely, Nevada, to Lagos, Nigeria, she had just turned seven. From Nevada to Nigeria and on to Peru, Bolivia, and Oklahoma, the family wandered the world, living in a state of constant upheaval. When We Were Ghouls follows Wallen's recollections of her family who, like ghosts, came and went and slipped through her fingers, rendering her memories unclear. Were they...