On the morning of July i , 1916 , Lieutenant Simon Jenson , shell-shocked and demoralized after a year and a half in the trenches , makes a life-altering mistake . But with his actions misinterpreted, he is celebrated as a hero . When Simon returns nfrom the war , his wife Sarah , and daughter , Lucy find him emotionally fragile and prone to violent rages . Caught up in her own rief and loss Elsa, the Jenson,s governess fron St John,s , is thrust into the middle of the family,s turmoil . Only when one of Simon,s fellow soldiers turns up and casts the shadow of the blackmail over them all does unexpected change force its way into their lives .