XXIX.--A Dinner Party Sub-rosa 169 XXX.--Écarté with Mr. Fothergill 174 XXXI.--A Startling Discovery 182 XXXII.--Forestalled 190 XXXIII.--A Gleam of Light 195 XXXIV.--Dr. Schofield's Opinion 199 XXXV.--An Invitation 204 XXXVI.--A Metamorphosis 209 XXXVII.--Mr. Marx is Wanted 218 XXXVIII.--I Accept a Mission 223 XXXIX.--My Ride 225 XL.--My Mission 229 XLI.--The Count de Cartienne 232 XLII.--News of Mr. Marx 240 XLIII.--About Town 246 XLIV.--A Midnight Excursion to the Suburbs 252 XLV.--A Mysterious Commission 258 XLVI.--A Brush with the Police 261 XLVII.--Light at Last 264 XLVIII.--A Page of History 269 XLIX.--I will Go Alone 278 L.--I Meet my Father 280 LI.--Dawn 284 LII.--Where is Mr. Marx? 287 LIII.--Messrs. Higgenson and Co. 293 LIV.--A Raid 299 LV.--The Mystery of Mr. Marx 304 LVI.--The End of It 308 MR. MARX'S SECRET CHAPTER I. NEWS FROM THE PACIFIC. My home was a quaint, three-storeyed, ivy-clad farmhouse in a Midland county. It lay in a hollow, nestled close up against Rothland Wood, the dark, close-growing trees of which formed a picturesque background to the worn greystone whereof it was fashioned. In front, just across the road, was the boundary-wall of Ravenor Park, with its black fir spinneys, huge masses of lichen-covered rock, clear fish-ponds, and breezy hills, from the summits of which were visible the sombre grey towers of Ravenor Castle, standing out with grim, rugged boldness against the sky.