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“I… felt that, once,” Waxillium said, expression distant. “When I held the Bands. That all things were one substance.”

“Indeed!” VenDell replied. “And states can change from one to the other. Energy can become Investiture. This is the soul of Feruchemy. Investiture can become matter. That is where harmonium comes from. And matter canbecomeenergy.”

“And an example of that is…” Steris said.

VenDell nodded to the destroyed room. “We just witnessed it, Ibelieve. There is anincredibleamount of energy trapped inside matter. You managed to release some of it—only a small amount of what you put in that box, but still. If you found a way to release its full potential… Well, Harmony says the destructive power of it frightens him. Deeply.”

“It should,” Waxillium said. “Because this was easy to accomplish. Far too easy.”

“Well,” VenDell said, “it does require two very rare substances. And a great deal of energy, correct?”

“A great deal,” he admitted. “For so small a sample. It would take quite a bit of electricity to scale this up. But the destructive potential…”

“Agreed.” VenDell’s skin had gone… not just pale, but actually translucent. “I… should report this. If you don’t mind, I’ll be upstairs communing with Harmony. Excuse me.”

Waxillium shot Steris a look. “Worst case?” he asked.

She considered. What was the worst thing that could happen? It seemed obvious to her.

“What if the Set already knows about this?” she asked. “Marasi said the dying man mentioned returning ash to the Basin. Maybe they plan to use bombs?”

Wax nodded, grim. He’dconsidered the same thing.

“If the Set has discovered this interaction,” she said, “then it was likely by accident—or through an experiment like ours. There might be a record of it.”

“We could search for unexplained explosions in the Outer Cities,” Wax said. “Smart. Ashes… What if an explosive like this were placed in one of the old Ashmounts? Could they be restarted?”

“That sounds appropriately terrifying,” Steris said, feeling a deep nausea. How had she never considered that possibility? Looked like she had some planning to worry about. But first things first. “I’ll order broadsheets from the Outer Cities from the library and have them delivered to the penthouse. We can start there.”

Wax nodded. “With Marasi’s authority, you should be able to access the constabulary records too.”

It was an excellent suggestion. Steris walked to the back of the room, passing Allik—who had found some remnants of his biscuits splattered on the wall—and stepped up to Marasi. It had been… pleasant spending more time with her lately. Their childhood hadn’t always encouraged sisterly affection. Their father—who was now retired to a country estate—had been embarrassed by Marasi’s illegitimate status. Steris had always worried Marasi would see it as a flaw in herselfrather than in theirfather.

Marasi seemed lost in thought, though what she found fascinating about the broken door was beyond Steris. However, she stayed quiet, not wishing to interrupt. Silence didn’t bother Steris. It was a purely neutral experience.

“The world is changing so fast,” Marasi finally whispered. “I’m barely accustomed to electric lights, let alone the airships. Then there’s this god… from another world. Now an explosive, a pinch of which can destroy a room…”

“I’m worried too,” Steris said. “I wish recent events had been possible to anticipate.”

“Makes me wonder,” Marasi said, “why I’m spending my time on murder cases and basic crimes. I realize they are important… but there are people out there, Steris, who know about it all. Who are making moves that change the fates of planets. They have no oversight, so far as I can tell. They’re probablyhappyto see us chasing down ordinary criminals and leaving them alone.”

“That’s why you hunt the Set,” Steris said, nodding. “Why you’ve devoted so much to them, when most in the precinct think you’re going a little overboard.”

Marasi chuckled. “Runs in the family, I guess.”

Steris smiled, then felt foolish, as Marasi wouldn’t be able to see it behind her face mask. Before Steris could say something, however, Waxillium blew himself up.

It was a much smaller detonation, fortunately, but it was forceful enough to throw him back and drop him to the ground. Steris ran over, worried—and found him dazed, but relatively unharmed. He took her arm as he sat up, shaking his head, his nice vest—a Versuli, no less—ripped and charred. The apron she’dprovided had protected it somewhat.

He brushed himself off. Though he didn’t like to admit it, hewasgetting older. Being exploded when you were twenty was far different from being exploded when you were fifty.

“So,” he said to her, “you mentioned something about secondary explosions?”

“It was on my list,” she whispered.

“It’s all right,” he said, patting her hand. “I feel fine. I just did something stupid. I was gathering that harmonium plastered against the backof the safe box. It’s too valuable to leave, and it must have reacted to the air or some liquid left from an earlier experiment—”

He sneezed, then smiled at her reassuringly. His mask was nowhere to be seen; it must have blown free in the explosion.