Read it through once

“We shall be at the Copper Beeches by seven o’clock, my friend and I. The Rucastles will be gone by that time, and Toller will, we hope, be incapable. There only remains Mrs. Toller, who might give the alarm. If you could send her into the cellar on some errand, and then turn the key upon her, you would facilitate matters immensely.”