As Dawn Breaks by Kate Breslin 

Amid the Great War in 1918 England, munitions worker Rosalind Graham is desperate to escape the arranged marriage being forced on her by her ruthless guardian and instead follow her own course. When the Chilwell factory explodes, killing hundreds of unidentified workers, Rose realizes the world believes she perished in the disaster. Seizing the chance to escape, she risks all and assumes a new identity, taking a supervisory position in Gretna, Scotland, as Miss Tilly Lockhart… Read more.