The book is available at Hathi Trust (I have not checked for other online sources).
Part I.—Russia.
Nepimoff's Father.
1. The Accomplishment of a Wish
2. Disinherited
3. In the Ghost's Gallery
4. Conchita D'algeciras
5. The Birthmark of the Nepimoffs
The Thief's Taper.
1. The Controlled Hand
2. Circumstantial Evidence
3. Denounced by the Dead
The White Wolf of Kostopchin.
1. The Coming of the Terror
2. The Working of the Spell
3. The Awakening of the Wolf
The Midnight Skater.
1. The Hut on the Island
2. On the Midnight Ice
Part II. England.
The Warning of the Sword
A Day's Shooting
1. The Squire Comes Home
2. Doveton Assizes
3. The Avenging Hand
What Was It?
The Ghost at the Proscenium
The Lady Isopel
48, Fernvalley Terrace N.
1. Told at the House-agent's
2. Unrest
3. Unravelling the Clue
Part III.— Italy, etc.
The Evil Eye.
1. Edgar Ravelston
2. Fiamma Di Vasari
3. Bertuccio Agostini
4. The Crater
The Marble Faun.
1. In the Campagna
2. The Treasure-seeker
3. A Rift in the Clouds
4. The Crimson Taper
From the Grave.
1. The Story of a Family Feud
2. The House of Vincorla
3. Cain
4. The Expiation
The Green Staircase.
1. A Sicilian Home
2. In the Picture-gallery
3. The Coming of Hymen
4. The Open Door