case with the slippers in it. People were crowding around, pointing and holding kids up. Most people didnât stay very long, but one personâa small woman with very short gray hairâjust stood staring. Around her throat was a necklace with a pendant shaped like the letter
A
.
âDo you notice anything?â Dr. Zapato asked me.
âItâs like that ladyâs stuck,â I said.
He nodded. âIn the last six months, sheâs visited the museum some twenty-five times. And sheâs not the first to become obsessively interested in the slippers either. So, to help us keep them safe, we decided to hire an outside security expert, one who came very highly recommended. I believe you know himâMr. William Will.â
CHAPTER EIGHTEEN
I almost dropped my pen. Mr. Will was working for the museum? Then he couldnât be the thief!
âWeâre talking about the same Mr. William Will, right?â I said to make sure. âMy auntâs boyfriend Mr. William Will?â
Dr. Zapato turned off the projector. âThe very same. With his assistance, we believed we had devised a foolproof method to ensure the slippersâ safety. Unfortunately, something seems to have gone wrong.â
âWhat foolproof method?â Charlotte asked.
Dr. Zapato said, âRF technology.â
Tessa wouldâve said, âWhatâs RF technology?â but I didnât want to sound dumb.
Luckily, Mr. Morgan explained. âRF stands for radio frequency. In this case, it means putting a tiny, chip-sized transmitter into an object so it can be followed by the positioning systems on satellites.â
Dr. Zapato went on, âTaking care not to detractfrom its historic value, we have âchippedâ each slipper. As a result, when they left the museum on Thursday with the imposterâthe man now in police custodyâwe were able to monitor their progress on handheld receiving devices.â
Mr. Webb held up a gadget slightly bigger than a cell phone. It was silver with a green and black screen that showed a grid pattern.
âWhen the slippers are transmitting,â Dr. Zapato continued, âtheir location shows up as red flashing dots. We were able to track the slippers to the White House and eventually to Mrs. Silverâs safe. But then, at one twenty-two Friday morning, the flashing dots disappeared. Apparently, something went wrong with the transmitters.â
âDo you think thatâs when the slippers were stolen from the safe?â Charlotte asked.
âVery possibly,â said Dr. Zapato, âbut thereâs no way to know for sure.â
âCould whoever have stolen them remove the chips from the slippers?â I asked.
Dr. Zapato shook his head. âFirst of all, the existence of the chips was a closely guarded secret. Secondly, theyâre implanted in the leather and cannot be removed without causing severe damage.â
I stopped writing and shook out my hand. Something was bugging me. Last night Mom had asked Mr. Will if it was okay to tell Tessa and me about the man in the black suit being an imposter. So that meant my mom mustâve known all about how Mr. Will was working for the museum, right?
âDr. Zapato,â I said, âwhat does my mom have to do with all this anyway?â
âI was getting to that,â Dr. Zapato said. âIt seems thieves typically find objects in transit easier to steal, so Mr. Will suggested we flush out the would-be thief by lending the slippers to the White House for a party. Your parents, Cammie, graciously agreed to help. We then leaked the information to the media, hoping that the thief would see an opportunity.â
Well, that was a relief. No matter what Mr. Lozana said, my mom didnât think she was a queen.
âAnd the plan worked,â Charlotte said. âThe man in the black suit tried to steal the slippers.â
âDid the thiefâthe man in the black
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