Penny Parker and her friends discover a strange cult operating at a local monastery. What is responsible for the strange sounds coming from the monastery? And is the mystery of the missing woman connected to the cult and the monastery as well? Find these answers as Penny investigates The Cry at Midnight This book is from the Penny Parker series by Mildred A. Wirt, also known as ghostwriter Carolyn Keene, of the Nancy Drew series of books.