This book is a wonderful and satisfying conclusion to a series that began four books back, and that has not disappointed once.
Amee, a planet linked to Earth via a dimensional corridor, has been invaded by an evil force that is slowly destroying it. Six Earth women--the Exotiques--are summoned to save Amee, and will stand together with their magic power to do so, or Amee first, and then Earth next, will be destroyed by the evil.
Each of the four previously summoned women found amazing Power and true love on Lladrana, and one had fulfilled her task and chosen to return to Earth. Echoes in the Dark focusses on the last two Exotiques summoned: Raine, who the Seamasters summoned on the sly, botched, and suffered immensely until she was discovered; and Jikata, whom the Singer (Amee's Oracle) herself summons to train as her successor. Both Raine and Jikata are key to the upcoming invasion of the Dark's nest since Raine will create the ship to sneak them close enough to attack, and Jikata, with her four-octave voice, will release the powerful spell that will destroy the Dark--and hopefully not all of her and her new love and friends along with it.
This book, like the others in the series, will keep you enthralled...but I recommend you begin with book one and work your way to the end of the series. A must-read for all lovers of romance and fantasy.