The needle flashed in the lamplight, drawing attention to itself that its wielder did not deliberately seek. But then, he did not inject in solitude either.
Cocaine to stimulate, morphine to calm. They chased each other in a vicious circle. Morphine to smother cocaine, cocaine to overpower morphine. Cocaine and morphine, morphine and cocaine. They were making daily appearances now where before it was only a few times a week and before that, a few times a month.
Holmes watched Watson put away the supplies with a growing concern. He could deny it no longer – the doctor was an addict.