“All right, Mr. Wrench. Never fear, I’ll find out what you want;” and with these words Mr. Slingsby took his departure.

On the following night he watched the entrance through which the workpeople passed in and out of the works in the Euston-road.

In the course of half-an-hour or so he observed Gatliffe pass through the door, and Mr. Slingsby followed at once. He was, however, much disappointed at finding his man make direct for the railway-station, and had in accordance with his instructions to give up the chase for that night.

On the succeeding evening he was again at his post, and very shortly before seven Gatliffe again passed out of the building—​this time to look a different direction. He walked on westwards, and entered a coffee-shop, where he remained for about half-an-hour or more, Mr. Slingsby keeping watch and ward on the outside.

He saw Gatliffe emerge from the coffee-shop, and then walk on at a smart pace, the detective following at a respectful distance. After this the young engineer went into a hosier’s shop, and purchased a pair of gloves.

He then made direct for Covent Garden Theatre, paid the entrance money, and went into the Promenade Concerts.

The detective did the same, and kept a sharp eye upon the movements of his man, who in the course of a few minutes was joined by a female, in whose company he remained for the whole of the evening. When the performance was over the two, upon reaching the street, called a four-wheeled cab, into which they both got. When the vehicle was driven off Mr. Slingsby jumped into a hansom, and told the driver to follow the four-wheeler.

The driver of the hansom obeyed the order given him, and in the due course of time the four-wheeler was brought to a standstill at the house in the occupation of Miss Stanbridge.

Mr. Slingsby saw its two occupants alight and enter the house in question; then he discharged his cab, and watched the house for some considerable time.

He saw a light in the parlour, and saw also the shadows of two or three persons, one of which appeared to be that of a man, the others those of females.