Entering Dennis's den

"You sure you want to do this?" 

James asks, and Mikael can sense the concern beneath his usual detachment.

 "With the boy dead, there's no reason why we can't sweep in and make this arrest ourselves."

"I'm not making an arrest, James,"

 Mikael says quietly.

 "Look, we have an opportunity here to understand what really happened. Why he killed those boys. What intervention might have prevented him from killing, and at what point. But that can only happen if we bring him out alive. Will you give me your word that you'll hold off doing anything drastic until there's no other option left?"

"That's a promise I can't make. You know that."

"James. We've come this far."

Before James can answer, they hear the wail of several sirens, and then several police cars, their lights flashing, come screeching up the road, encircling the three NBI cars.

"What's all this?" Mikael asks.