King of Morning, Queen of Day

Ian McDonald
1991

Winner of the Philip K. Dick Award and the Prix Imaginales: Three generations of women share a mysterious power - one that threatens to destroy them...

In early-twentieth-century Ireland, life for Emily Desmond is that of the average teenage girl: She reads, she’s bored with school, and she has a powerful imagination. Then things begin to change. Her imagination is so powerful, in fact, that she wills a faerie into existence - an ability called mythoconsciousness. It’s this power that opens a dangerous door that she will never want to close, and whose repercussions will reverberate across time.

First to be affected is her daughter, Jessica, who, in the mid-1930s, finds that she must face her mother’s power by using the very same gift against her. 

Then, in the near future, Jessica’s granddaughter, Enye, must end the cycle once and for all - but it may prove too powerful to overcome.

Fonte: Goodreads - King of Morning, Queen of Day