Gentian Hill
Elizabeth Goudge

As they grew up, the world rushed into their magic kingdom. War raged--a war to challenge the bravest of men. Zachary answered that challenge, knowing it would sweep him far away, into the depths of danger. Yet he vowed to return to Stella, no matter what, no matter how.
Intertwined with the local legend of St. Michael's Chapel at Torquay, Zachary and Stella's story takes them from the secluded Devonshire valley to the perilous Mediterranean seas and finally to the poverty and squalor of eighteenth-century London.