"Ouch," Sinner said dryly. There was only the slightest of pauses before his eyeball rebuilt itself, then he gargled and spat the bullet out into his palm. He offered it to Bad Penny. "Yours, I believe."

She snarled prettily, made her guns disappear, and snatched two silver knives out of nowhere. She buried them both up to the hilt in his chest. They were magical weapons, scored with ancient runes, one cursed and one blessed. I'd known gods who would have died from an attack like that. Sinner just stood there and took it. I felt like applauding. Bad Penny folded her arms over her impressive chest and pouted.

"Now that's just not fair, darling."

"Step aside, Sidney," said Pretty Poison, at Sinner's shoulder. "I have business with this woman. Very nasty business."

"No," said Sinner.

"She tried to kill you, my darling! I can't allow that to go unpunished. It's not in my nature."

"You came up out of Hell to be with me, in order to change your nature. Remember?"

"Yes, but..."

"Hush," said Sinner, and the demon succubus hushed, for the moment.

Bad Penny poked out her tongue at Pretty Poison, then smiled hopefully at Sinner. "If you're not actually going to kill me, darling, could I please have my knives back? They are family heirlooms, and Daddy would be furious if I lost them."

Sinner tugged the blades out of his chest with some effort and handed them back in a gentlemanly way. Bad Penny accepted the knives, glanced briefly in my direction to see if she still had a chance of picking me off, decided she hadn't, and made the knives disappear. I came forward to join her.

"What are we going to do with you, Penny?" I said. "We can't just let you go. You'd only carry on following us, looking for another good place to ambush us, with better weapons. You're like me; you never give up on a case."

"I am nothing like you, John Taylor! I have style."

Faster than any of us could react, Pretty Poison surged forward, grabbed Bad Penny by the throat and bent her over backwards. Penny squealed and struggled furiously, but couldn't break the succubus's hold. Pretty Poison's fingers now ended in claws, and her widely smiling mouth was packed full of pointed teeth. The red lips were very close to Penny's neck, and she didn't look like an English public school girl any more. She looked like what she was, a demon spat up from Hell.

"Don't!" said Sinner. He started forward, then stopped abruptly as Pretty Poison set her sharp teeth directly against Penny's throat, the points just dimpling the skin. Sinner raised his hands calmingly. "Please. Don't kill her."

"She has to die," Pretty Poison said reasonably, her lips brushing Penny's throat. "You heard her, Sidney; she's under orders to kill anyone who might talk to us. Either I rip her throat out, or the case stops here."

"No case of mine has ever been worth the sacrifice of an innocent life," I said.