"In the middle of a Christmas holiday in Dharma, Brooklyn and Derek receive a phone call from their friend Claire in Scotland. The laird of the castle has just proposed to her! They plan to be married on New Year's Day, and they want Derek and Brooklyn to be their witnesses. While they're visiting, Claire hopes that Brooklyn will be able to solve a mystery in the castle library--twelve rare books have gone missing. When one guest is poisoned and another is killed by an arrow, Brooklyn and Derek must find a killer and a thief before their friends' bright and happy future turns dark and deadly"--