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Middle School is finally over for Grace Brooks and she couldn't be happier for her graduation. All that lies between Grace and high school is one final summer. And what a summer it is as Grace and Jack discover yet more deeply hidden secrets and embark on their most unusual trip to date. When Jack takes one too many secret trips, he finds himself facing the very real possibility of running out of time altogether. Can Grace gather her wits and figure out how to save him from the Treacherous Tunnel before time is up?

With the end of the school year fast approaching, Grace and Jack are looking forward to what their summer might bring. As a final goodbye to middle school, they decide to take one last trip from their science class, the place where their adventures all began. What starts out like any other trip quickly goes drastically wrong when they are spotted upon their return to class. To make matters worse, they discover the mysterious ink is having side effects not only on them, but also on their favourite travel spots. 

Their last time-travelling mishap still fresh in their minds, Grace and Jack are on edge about what might happen next. Grace’s memories of her solo trip to the future are never far away. When the future begins to seep out into the present, they must stick to the rules or risk the consequences. They set themselves the task of finding out more about the mysterious ink, ending up in the past in a mysterious science lab. Could their new discovery also shed some light onto their mysterious friends at 21BUT22?

Bryce was so close to getting home. Now he’s back on the run, hiding from Rangers inside Final Kingdom waiting for the bridge to reopen. But time is running out. Mysterious glitches are tearing at the virtual world’s fabric and could leave him permanently stranded. Zach, Andrew, Jess, and Maggie think they’ve located Bryce, but the military has taken over control of the JOSHUA Project and getting Bryce home may no longer be their top priority. While Q2 has scattered and abandoned the Eden machine, Yao is determined to build something even more powerful from his base in China.

Bryce never meant to disappear. At the start of his senior year of high school, his focus was on getting into college, running track, and spending as much time as possible with his girlfriend, Maggie. But a cryptic invitation to join an elite computer programming unit at one of the world’s top high-tech gaming companies unlocks a level of intrigue and deception far beyond his imagination.