The Unquiet Spirit By Steen, Marguerite Books / Paperback Special Collections / Author Archives › Barbara Mertz Collection Publisher: Avon, January 1969 Price $12.51 Free Shipping Send to a friend Collectible - Good Collectible - Good. Stamped on page edges. Barbara G. Mertz Rev Trust custom bookplate on front inside cover. This book formed part of Barbara G. Mertz's personal library at her home in Frederick, Maryland. (horror, fantasy) $12.51 1 in Stock at Warehouse Quantity Add Free Shipping to continental U.S. OR $1.00 per item discount if shipped to store.