Together we went through the old laboratory and climbed the stairs to the doctor's private study. The door was very strong, with an excellent lock, but the locksmith knew his job. Soon the door stood open and I entered the study. I opened the cupboard and found the shelf. Sure enough, the powders, the bottle and the book were there, and I took them home with me.

At home I locked at everything more carefully. There were several packets of white powder and a bottle of red, strong-smelling liquid. The book contained nothing except a list of dates, going back several years. The last date was nearly a year ago. Here and there the doctor had added a few words. The word' double' appeared very early in the list, followed by the word 'Failed!!'. 'Double' appeared in the list several more times…What was Jekyll doing? The book looked like a list of unsuccessful experiments.