Beware of the Dog, 15

Is a mutilated photograph the key to Hardy's 15th case?The woman was dangerous, even over the phone. Cliff Hardy knew he should have listened to his instincts when he first met Paula Wilberforce. Instead he becomes embroiled in a high-society family full of old rivalries and hatred, his gun is stolen, and he is wanted in relation to a shooting. He has to find the answers quickly, before the murderer strikes again. The only lead he has is a mutilated photograph. Whose face is it? And what are those strange shadows in the background?