Ashlyn Revere is recovering from a traumatic brain injury, and struggling to learn how to walk and talk again. Frustrated with the slow pace of her rehabilitation, she escapes in her dreams to the Western Marches of Summervale, a fantasy realm where she is the Warden. With her sister Penny battling cystic fibrosis, finally receiving a necessary--and potentially deadly--double lung transplant, Ashlyn finds herself powerless to help her sister...in this world. Ashlyn's only hope to save her sister is to cross the Hudson to confront the unquiet ghost of the organ donor--and to face the wrath of the Dark Lord who controls the New York City of her dreams. As Penny hovers near death, Ashlyn finds herself in the fight of her life, battling true evil and hoping to escape a perilous world of her own creation. A CIRCLE OF MOONLIGHT is the sequel to the acclaimed A CIRCLE OF FIRELIGHT and continues the story of the Revere sisters. It is the second volume in the CIRCLE SAGA.