Begun by Time (Elizabethan Time Travel #0.5)

In the final days of World War II, Catherine Hastings meets the man she wants to marry. Flight surgeon Jonathan Brandon isn't just handsome―he's everything Catherine could hope for in her betrothed. But her dream of a happily ever after is shattered when Jonnie vanishes before their wedding, leaving Catherine bereft, broken-hearted, and with a lifetime of unanswered questions.
Arthur Howard is smitten with the lovely Catherine the moment he sees her. He's certain he's found the woman he wants to marry. Yet behind Catherine's sparkling green eyes is a haunted look―the look of a woman who has known loss. Can he love a woman who still grieves the loss of her fiancé? Arthur must find answers to the mystery surrounding the man Catherine intended to marry. What he discovers is a truth far stranger than fiction.