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“He’s still broadcasting!” Louise whispered.

“I know.” Jillian got her tablet and hacked into Tesla’s systems. “There, he’s looping the feed from two minutes ago.”

“What about the time stamp?”

“I fixed that. Don’t worry.” Jillian tossed her tablet onto her bed and went to open Tesla’s hidden storage compartment.

“We’ll have all tomorrow to play with that.” School officials had decided to suspend classes since the city had closed the street down.

“I want to see if it works. Besides, Aunt Kitty will be here babysitting us, and she’s not going to let us ‘play quietly in our room.’ She’ll want to do fun things.”

Louise had to admit that was true.

Their grandmother had been a firm believer that love made a family, not blood. She’d taken in her daughter’s best friend, Kitrine Green, when the teenager’s mother chose her drug-dealer boyfriend over her child. Despite being poor, their grandmother had supplied Kitrine with an electronic keyboard and encouragement to follow her dreams. Now a successful composer and songwriter, Aunt Kitty had an extremely flexible work schedule and often acted as their emergency backup parent. Her babysitting, though, came at the price of entertaining her.

When they were little, she told them that she was their fairy godmother, appearing as if by magic with plastic glass slippers and costume-ball gowns. Their first introduction to creating videos came on Aunt Kitty’s visits as they acted out fairy tales complete with original scores. Lately they had found themselves at fascinating places like behind the scenes of a Broadway musical production, or at a recording studio, or at the NBC television studios. Aunt Kitty would think that the twins were truly upset by the bombing if they resisted any adventure that she could cook up.

And if their parents thought they were emotionally troubled, there be no privacy for them until they’d “dealt with the trauma.”

“What should we use to test it?” Louise slipped out of her bed.

“The ley line mapping spell.” Jillian pulled out the package of transferable circuit paper they’d ordered online. The printer that could use the paper to print out digital circuits was hidden in the back of their closet. They were quickly running out of hiding spaces.

“It’s not going to find any ley lines.”

“Probably not, but we could be sitting on top of one of those fissures that Dufae talked about and never know it.”

“In Pittsburgh, weird things happen around ley lines, especially with machines. Metal conducts magic, and it does nasty things to active spells.”

“It’s the one spell we know works with the generator. Kensbock used it to test his prototype.”

Which would be more comforting if he hadn’t vanished into thin air shortly afterwards. It had been his invention that caused his disappearance, not the spell he used.

Jillian continued on, getting the printer out of the closet. “We should make sure that our work environment is magic-free prior to any large-scale experimentation.”

Jillian had a point and of all the spells they could cast, the mapping spell was probably the safest. Louise abandoned her reluctance with a sense of relief and growing excitement. They were going to cast their first spell!

Louise quickly copied the spell for printing while Jillian loaded the paper into the printer.

“Okay, hit it!” Jillian whispered with excitement.

Louise hit “print” and — the longest thirty seconds that Louise had ever experienced later — the printed spell came out. “Okay, now we need to get the pastry board.”

Dufae had spent a page talking about building his spell-casting room. He needed a stone surface to act as insulator. Dufae had bought several four-foot by twelve-foot slabs and laid them as a floor, complaining about the seams he needed to bridge on the larger spells. The twins had ordered a twenty-four by eighteen inch white marble pastry board that weighed a whopping thirty-six pounds. It had taken both of them to carry it upstairs and hide it between Jillian’s mattress and box spring.

Getting it back out was harder than Louise expected. Things at rest stayed at rest, especially with a twin-size mattress on top of it.

“If we just had a pulley and a rope. .” Jillian whispered.

“. . Mom would bitch at us for putting a hole in the ceiling!” Louise finished. “Wheel your chair over, we’ll use that.”

“We can just put it on the floor.”

“We need to plug the generator in.”

Jillian swore softly. “How long is the plug?”

Kensbock designed the generator with a stupidly short 220 plug. The only 220 outlet in the house was in the basement for the dryer. They had bought a step-up-and-down voltage converter transformer. Unfortunately, it too had a short plug.

“We need to make this a battery-powered unit,” Louise whispered.

“Yes!” Jillian cried in agreement.

“Shhh!” If they got caught with evidence scattered all across their bedroom, they’d be so grounded.

Jillian slapped hands over her mouth.

They froze in place. Jillian’s eyes flicked right to left a million miles per second as she thought up lies to cover what they were doing, just in case. After two minutes, it was obvious that they hadn’t been heard.

All told, it took them half an hour to get the pastry board within range of the plug, the protective sheet peeled off the printed circuit, the spell carefully positioned on the marble, and the transformer plugged in. After a great deal of consideration, because the magic generator didn’t have an on/off switch, they decided to connect the leads to the spell prior to plugging it in. Since Louise had more experience with the soldering iron from set making (still something their parents didn’t know), she connected the leads to the spell. She had noticed that some of Dufae’s spells were used for healing — how would they connect the leads to that spell without burning the patient? Obviously they would have to use something like clay or paste.

Finally it was time. They plugged in the generator. Louise noticed nothing different, but Jillian gave a slight “Oh” of surprise.

“Is it working?” Louise asked.

“Doh. Yes.”

Louise frowned at the generator, wondering how Jillian could be so sure.

According to the codex, each spell needed a certain frequency of magic to operate. Apparently, naturally occurring magic was like light in that it contained a wide spectrum. Written spells used a narrow frequency to both limit and channel power. Dufae’s description of “dirty magic” probably was because the magic that leaked across consisted of constantly shifting frequencies. It would be like trying to use a flashlight as someone kept switching the type of batteries. Dufae complained about the fact that his “magic cleaning system” gave him one steady source of magic at the cost of being limited to one frequency. Luckily for the twins, the next section of the codex was devoted to taking that one frequency and stepping it up or down via translation spells that Dufae created through trial and error. Because of it, every spell in the book was available to them.

Louise wondered how Kensbock ended up matching his generator to the one spell in his possession. Had he set the generator to the spell? Or had he rejected several spells before finding one that matched his output? The more she thought about it, the more she felt sure that his kidnapper had selected the spell and given it to him on a silver platter. Someone had been tracking his progress and acted quickly after he reached a successful conclusion. Kensbock had made extensive notes on everything, except where he had found the spell. Dufae had noted that the spell was one of the first ones taught children; he’d dissected and reconfigured it in trying to deal with his situation on Earth with the dirty magic. Had Kensbock been given it because it was so simple — or because it matched the frequency of another spell? If Louise had been the one manipulating the man, it would be the latter. But what spell would it be?