‘Back to the pills, Katherine. You locked them in your car to keep them safe. But Sofia’—she was still looking down at her lap, shoulders shuddering with silent tears—‘wasn’t done. She tried to get the pills back. Sofia, when you told me you saw someone at the maintenance shed, you couldn’t have seen them from the bar. That storm was a whiteout: I’d been sitting by the window myself and couldn’t see into the car park. Which means you had to be in the parking lot to see Erin go into the maintenance shed. Katherine’s window wasn’t broken by the storm, it was broken by you, desperately trying to get the pill bottle you thought she’d locked in her car. But Katherine had sent Andy out into the storm to get her bag earlier. She suspected you’d try something like that, so she changed her mind and wanted them on her at all times. Which is also why she wouldn’t let me keep the bottle overnight.’

I knelt in front of Sofia and put a hand on her shoulder, squeezing gently. ‘I’m not saying all this for no reason, Sofia. We will help you through this. But I need you to be honest with me with this next question.’

She looked up at me, eyes bloodshot, and dragged her forearm under her nose. ‘I swear. I did that surgery the same way I would have done any other. It’s like the story of the drunk pilot who lands the plane, you know? I didn’t’—she hiccupped—‘I don’t know what happened. It just went wrong. Since then, Katherine’s been helping me. I want to get better.’

‘I know.’ I gave her a hug and whispered in her ear. ‘You’re a good surgeon. You let your addiction get out of control, but we can fix things. I just need you to be honest here, and help me find the real killer. For Michael and Lucy. You’re strong enough to give this up and you’re strong enough to help me, even if you might be embarrassed at first.’ I felt her nose brush against my neck, up and down. A nod. I stood. It wasn’t fair that I was hanging everyone else’s laundry out to dry and not my own. It was my turn.