Previously, on Detentionaire:

"But wait... why did it fail to open it then? Was the method wrong then?"

"No, the method was not wrong. It was all..."

"Message received. Remote signal sent. Coral Grove self-destruct override activated with t minus 5 minutes. Emergency rescue forces deployed."

"I'll explain on the sub! Just go!"

"What about everyone else? Like your mom, Kimmie? And all the workers here?"

"Don't worry, my mom got herself out, and her robots are probably getting everyone else out too!"

"Take this and go! I'll hold them off!"

"You lost your marks!?"

"She... she didn't get out..."

"No... that can't be..."

The now-sizeable group disembarked from the submarine and headed towards the flying machines parked nearby - the same ones that had nearly taken Lee and Tina to Coral Grove all that time ago. "Alright, look, these things aren't that big... I'll take one, you" - here Lee gestured towards Biffy - "grab that one, and Holg can drive the third one."

"Uh, Lee... don't you remember? You can't open the tunnel entrance, not even with one of the keys!", Biffy exclaimed with some impatience. "Oh, and even if you could, we - well, most of us", Biffy said, glaring at Holger, "weren't exactly the best drivers around last time."

"You're right. I guess we'll have to go to the casino then...", Lee said, trailing off, and then with some more determination: "Come on, let's go!"

They were about to leave when Li suddenly exclaimed: "Wait! We may need to be cautious. If what she said is correct," Li continued, nodding towards Kimmie, "even my casino might not exactly be very welcoming right now."

Lee sighed in agreement with his brother. "He's right. We're gonna go, but guys - be careful."

As they walked up to the elevator to the casino, Biffy asked Lee: "So, about this pyramid destruction plan of yours..."

"Yeah, yeah, I know... I haven't figured out the details yet, as usual. It's gonna be tough to do it on our own, of course, but I'm working on it!"

"Yeah, because you've managed all of this so well by yourself until now, right? Going solo much?" Lee rolled his eyes at Biffy's remark, but he smiled slightly at the same time.

"Lee," Tina said, "we're all in this together. Don't worry. With all of us working together, we'll figure it out," Tina continued, exchanging smiles with Lee.

Suddenly, Lee's brother yelled: "Run! Now!"

"What is it?", Lee exclaimed.

"It's gone! They've captured it! Just run!", Li continued, already having set off towards the flying machines.

Lee suddenly realized what his brother had noticed. Out of the corner of his eye, he saw a camera swivel around in their general direction. He took off running after Li, and almost immediately so did the rest of them. "Quick, into the transports!", Lee exclaimed.

"It's locked, remember?", Biffy yelled.

"I don't care - there are only three of these here! They can't follow us like this!" The sense of urgency was suddenly heightened as the elevator doors opened to reveal several burly-looking men. With some help from the adults among them, they finally managed to start the vehicles. They escaped just as the men had almost reached them. Turning around, they saw that the men had stopped chasing them.

"Well, I guess it's out of the frying pan and...", Lee started to say to Biffy, whose craft was hovering side by side with his.

Biffy, however, interrupted him: "Don't say it. Just don't."

Their journey was quick and uneventful, but when they had almost reached their destination, Lee exclaimed: "Uh, Biff, remember that key thing?"

"Yeah, what about it?", Biffy said, having turned his head back slightly to look at Lee. "I told you, you can't open it!" Then he turned his gaze forward again and saw what Lee had just seen.

"I don't think that's going to be a problem."

The passageway to the pyramid was open for some reason. Not only that, but the room containing the structure was completely empty. They all thought this was strange, but what they (or at least those in their group with knowledge of the objects) thought was completely bizarre was what they found lying on the floor: the book and cipher - and next to them, one of the keys!