While they were still at fault a man named Mullins, a plasterer by trade and an ex-member of the Irish constabulary, who knew Mrs. Elmsley well and had often worked for her, came forward voluntarily to throw some light on the mystery. Nearly a month had elapsed since the murder, and he declared that during this period his attention had been drawn to the man Emm and his suspicious conduct. He had watched him, had frequently seen him leave his cottage and proceed stealthily to a neighbouring brickfield, laden on each occasion with a parcel he did not bring back. Mullins, after giving this information quite unsought, led the police officers to the spot, and into a ruined outbuilding, where a strict search was made. Behind a stone slab they discovered a paper parcel containing articles which were at once identified as part of the murdered woman's property. Mullins next accompanied the police to Emm's house, and saw the supposed criminal arrested. But to his utter amazement the police turned on Mullins and took him also into custody. Something in his manner had aroused suspicion, and rightly, for eventually he was convicted and hanged for the crime. [Illustration: "HAD ... FREQUENTLY SEEN HIM ... PROCEED STEALTHILY TO A NEIGHBOURING BRICKFIELD."] Here Mullins had only himself to thank. Whatever the impulse--that strange restlessness that often affects the secret murderer, or the consuming fear that the scent was hot, and his guilt must be discovered unless he could shift suspicion--it is certain that but for his own act he would never have been arrested. It may be interesting to complete this case, and show how further suspicion settled around Mullins. The parcel found in the brickfield was tied up with a tag end of tape and a bit of a dirty apron string. A precisely similar piece of tape was discovered in Mullins's lodgings lying upon the mantelshelf. There was an inner parcel fastened with waxed cord. The idea with Mullins was, no doubt, to suggest that the shoemaker Emm had used cobbler's wax. But a piece of wax was also found in Mullins's possession, besides several articles belonging to the deceased.