She had a reputation as a novelist who wrote as vividly about the adventures and experiences to be encountered in the inner realms of the human consciousness as she did about those in the outer physical world.
Set in Bronze Age Britain, it was inspired by a vivid experience she had in Dyce Stone circle in Scotland, and the world heritage site of Avebury in Wiltshire.
For many years this trilogy was required reading for various tour groups visiting the sacred sites of Britain from America, and has been in print continuously since 1977.
As a result of these books, she was invited by the pop star Tina Turner to act as a personal guide to the ancient sites of Egypt – an experience that Moyra spoke of with great fondness.
Although fascinated by prehistory and the Celts, Moyra was also knowledgeable about other traditions and devoted the major portion of her life to collecting and examining myths and legends across the world.
She followed Jung and Joseph Campbell in believing myths and legends are not "just" stories but actually deep and meaningful expressions of the universal and eternal in the human psyche.
In 1987, with Oliver's health failing, the Caldecotts moved to Bath, a city whose Romano-British heritage Moyra wrote about in two of her novels, The Winged Man (1993) and The Waters of Sul (1997).
She was also a founder member of the (now dormant) Bladud Society, dedicated to raising awareness of Bath's Celtic heritage, and in her later years she liked to perform her visionary poetry at local open mic events in the city.