In the middle of a wonderful Christmas holiday in Dharma, Brooklyn and Derek receive a frantic phone call from their dear friend Claire in Loch Ness, Scotland. The laird of the castle, Cameron MacKinnon, has just proposed to her! They plan to be married on New Yearโs Day, and they want Derek and Brooklyn to be their witnesses. And while theyโre visiting, Claire hopes that Brooklyn will be able to solve a little mystery thatโs occurred in the castle libraryโtwelve very rare, very important books have gone missing. Once in Scotland, Brooklyn starts working on the mystery of the missing books but is soon distracted by all of the thumping and bumping noises sheโs been hearing in the middle of the night. Youโd think the Ghost of Christmas Past had taken up residence. But when one of the guests is poisoned and another is killed by an arrow through the heart, Brooklyn and Derek know this is not the work of any ghost. Now they must race to find a killer and a book thief before another murder occurs and their friendsโ bright and happy future turns dark and deadly.