The needle slid in easily, the result of many years of practice. He was ready. The memory of a pathologist's faces lead to a slight hesitation to push the plunger and made him think about what he was doing.
If he followed through, he could hurt her, again.
If he followed through, he could lose her, permanently.
Sherlock Holmes removed the needle from his vein, placed the syringe on the bedside table, and picked up his phone to make one of the most difficult calls in his life.
"Mycroft, is your offer of finding appropriate rehab still on the table?"