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Upper Middle Grade Mystery • STEM Adventure • Time Slip • Ages 11–14
Middle school is over, and Grace Brooks is ready for a normal summer. No experiments. No time slips. No surprises.
But when Grace and Jack uncover a hidden tunnel connected to their past travels, they realize time still has one final test waiting for them.
Curiosity pulls Jack deeper into the tunnel's twisting paths-one trip too many-and suddenly he begins slipping between moments, fading faster each time. With Jack running out of time, Grace must piece together everything they've learned about science, time, and the mysterious ink to save him.
The tunnel holds the truth behind their journeys-and the cost of discovering it may change their futures forever.
Book Five of the Miller's Island Mysteries - a high-stakes finale where science, courage, and friendship are pushed to their limits.
Tropes: Hidden tunnel, race against time, friendship rescue, final mystery, science saves the day
Tone: Urgent, emotional, triumphant
Heat Level: None / Age-appropriate
Comps: National Park Mysteries, The Last Kids on Earth (lighter stakes), When You Reach Me
Middle school is over, and Grace Brooks is ready for a normal summer. No experiments. No time slips. No surprises.
But when Grace and Jack uncover a hidden tunnel connected to their past travels, they realize time still has one final test waiting for them.
Curiosity pulls Jack deeper into the tunnel's twisting paths-one trip too many-and suddenly he begins slipping between moments, fading faster each time. With Jack running out of time, Grace must piece together everything they've learned about science, time, and the mysterious ink to save him.
The tunnel holds the truth behind their journeys-and the cost of discovering it may change their futures forever.
Book Five of the Miller's Island Mysteries - a high-stakes finale where science, courage, and friendship are pushed to their limits.
Tropes: Hidden tunnel, race against time, friendship rescue, final mystery, science saves the day
Tone: Urgent, emotional, triumphant
Heat Level: None / Age-appropriate
Comps: National Park Mysteries, The Last Kids on Earth (lighter stakes), When You Reach Me
Related Subjects
Extended Details
- SeriesMiller's Island Mysteries #5