XII. IN GREAT PERPLEXITY 137 XIII. A SCIENTIFIC MURDER 144 XIV. SUSAN BRINGS MARY TO AN OLD LOVER 157 XV. IN THE LAND OF PHANTOMS 166 XVI. SUSAN GOES TO CHURCH 179 XVII. A DARKENED MIND 188 XVIII. AMONG THE GREEN LEAVES 200 XIX. CATHERINE KING VISITS MARY IN THE COUNTRY 211 XX. CATHERINE'S DISCOVERY 221 XXI. CONDEMNED TO DEATH 228 XXII. AN EVENTFUL DAY 238 XXIII. THE TAKING AWAY OF THE SHADOW 248 XXIV. DESPAIR 259 XXV. THE FIRST WARNING 268 XXVI. SHATTERED IDOLS 278 XXVII. THE SECOND WARNING 288 XXVIII. AGAIN THE SHADOW 299 XXIX. THE THIRD WARNING 307 XXX. THE LAST OF SUSAN RILEY 317 XXXI. PEACE 325 THE THREATENING EYE. CHAPTER I. THE EDUCATION OF MARY GRIMM. A street in Brixton--one of those dreary streets of what the house-agent calls eligible eight-roomed residences, in which all the houses are as like each other as so many peas out of one pod: each two-storied; each looking out on the street through six windows; each with its little flight of stone steps leading up to the front door; each with its garden just six yards square; each with its severe respectability of expression. For houses, like men, have their expressions which reflect the characters of their inmates. There is the prim Puritanical house; the dissipated villa with its neglected gate; the ostentatious _nouveau riche_ mansion, turning up its nose at its neighbours; the well-kept pretty cottage, looking contented with itself and all the world, containing as it does the newly-married couple; the cynical abode of crusty old bachelorhood surrounded by whims and fads; and so on, each from palace to slum with a face the meaning of which he who knows how may read. Now the houses of this Brixton Street were of the respectable-genteel class of houses, not over-wealthy, but very respectable; possibly come down in the world some of them, but all essentially genteel.