The protagonist Tara Martin disappeared 20 years ago. When she returns she claims she spent 6 months in Faery. Her family and boyfriend have been devastated by her disappearance and respond in various ways to her tale. I’m Not sure this really belongs in SciFi, since the focus is more on the internal psychological world than the magical aspects.
So I liked a lot of the book, but unlike many other reviewers could see the ending from a mile away (well not the epilogue part). Perhaps, it reminded me of the book “Giants of the Frost” by Kim Wilkins.