Abstract: Baffling robberies and mysterious murders are the stock-in-trade of Miss Victoria Lincoln, private detective... After Professor Marchant dies, his house, Bartley Towers, is visited nightly by a sinister enemy, which frequents the gallery containing the Professor's collection of antiques and curios. When the detective investigates the case, she calls on the assistance of Caroline Gerrard... Thereafter, Miss Lincoln and Miss Gerrard investigate a series of bizarre cases, which are seemingly insoluble...until Victoria Lincoln gets to work...