After a court martial in January 1917, five Frenchmen convicted of self-mutilation (in order to avoid combat in WW I) are dragged along the network of zigzagging trenches to the improbably named frontline trench, "Bingo Crepuscule." What exactly happened in Bingo is as labyrinthine as the trenches themselves, but Mathilde Donnay, the fiancee of one of the soldiers, is a determined young woman whose wheelchair is unable to contain her fiercely independent and willful spirit. Aided by an indulgent, well-to-do father, a generous private investigator, soldiers who survived the conflict and the families of those who didn't, Mathilde begins the long and spotty process of re-creating events. A Very Long Engagement by author Sebastien Japrisot, Sébastien Japrisot, . Published by Sodis. This book has a 13 digit ISBN number 9782070387366 and a 10 digit ISBN number 2070387364.