Book Review: ‘The Spartan Sacrifice’ by Andrew Varga | A Jump in Time Book 4

‘The Spartan Sacrifice’ is the thrilling continuation of Andrew Varga’s time travel series. Photo: Barnes & Noble

Related Post: Time Travel Meets Thermopylae: ‘The Spartan Sacrifice’ Is Here

⚔️ Rewriting History: A Review of ‘The Spartan Sacrifice’ by Andrew Varga

In the high-stakes world of Andrew Varga’s A Jump in Time series, the past isn’t just a memory, it’s a battlefield. The fourth installment, The Spartan Sacrifice, takes the series to a fever pitch, blending the grit of ancient warfare with the mind-bending ethics of time travel.

The Stakes: A Vision of Global Domination

Victor Stahl’s bid for power is no longer a shadow play; it’s an accelerating threat. As a congressman with presidential aspirations, Stahl isn’t just looking to win an election, he’s looking to “fix” humanity by erasing most of it. With his own team of time travelers, he is systematically manipulating history to pave the way for his dark utopia.

The Mission: 480 BCE

Fearing they are running out of time, 17-year-old Dan Renfrew and his partner Sam jump back to ancient Greece. They land on the eve of the legendary Battle of Thermopylae. While their primary goal is to thwart Victor, they are quickly pulled into the brutal reality of King Leonidas’s stand against the Persian Empire.

Why This Installment Stands Out

Varga vividly recreates the tension of Sparta, immersing readers in the harsh realities of the vastly outnumbered warriors.

  • Historical Immersion: The detail enriches the narrative without stalling the momentum, making the ancient world feel immediate and dangerous.
  • Character Growth: Dan’s evolution is a highlight. His courage is now tempered by the heavy responsibility of his powers and the unintended consequences of his actions.
  • Visceral Narrative: Writing in the first person, Varga puts us directly in Dan’s head. From the opening nightmare of vengeful horsemen to the “anxious vibe” of a lecture hall, the prose is sharp and evocative.

“As soon as I swung open the door to the lecture hall where the medieval club met, I could sense something was wrong – an anxious vibe hung over the room like a dark gray storm cloud.”


At a Glance: The Spartan Sacrifice

CategoryDetails
SeriesA Jump in Time (Book 4)
GenreYA Science Fiction / Historical Drama
SettingAncient Greece (480 BCE)
ThemesPower, Ethics of Time Travel, Heroism
Best For Fans OfQuantum Leap, historical thrillers, and fast-paced YA

Final Verdict

Suspenseful and thought-provoking, The Spartan Sacrifice skillfully balances action with ethical complexity. It explores a chillingly timely theme: Whoever controls the past writes the future. When a catastrophic accident disrupts the timeline, the moral weight of altering history becomes more frightening than any villain’s scheme.

“As long as Victor controlled the past, he could write the future, and our little group was just a speck of dust he could whisk off the page.”

Rating: Highly Recommended for readers who love high-stakes adventures and the “what if” of historical events.

Rating: 4 out of 5.

About the ‘A Jump in Time’ Series

If you’re new to the series, it follows Dan Renfrew, a normal teenager who discovers he is descended from a line of “time jumpers.” These secret heroes resolve glitches in the time stream to ensure history stays on its proper course.

From 1066 England to the gates of Sparta, Dan must battle malevolent jumpers whose lust for power threatens the entire future of the world. It’s a modern-day Quantum Leap that asks: How much would you sacrifice to save the world?


*Thank you to Michela Malafaia / Imbrifex Books for the gifted copy for review consideration. I haven’t been compensated for this review and all views and opinions expressed are my own.

‘The AI-Ready Human:’ Paul Slater’s Roadmap to Future-Proofing Your Career

‘The AI-Ready Human’ is the new business developement book by Paul Slater. Photo: Barnes & Noble

New Book Spotlight: The AI-Ready Human

Your 90-Day Program to Stay Relevant as Technology Transforms Work

By Paul Slater

In a world of seismic technology change, AI is rewriting what it means to be “good” at your job. The professionals who thrive won’t just be the ones who know how to code; they will be the ones who sharpen the capabilities that make technology actually useful: judgment, adaptability, resilience, and clear thinking.

Part Book, Part 90-Day “Brain Workout”

The AI-Ready Human replaces traditional chapters with 90 concepts (days) that build on each other to make you AI-Ready.

Every daily concept includes:

  • Clear Explanation: No jargon, just the facts.
  • Career Impact: Why this specific concept matters for your professional future.
  • Practical Exercises: Tangible steps you can take to grow.
  • Reflection Prompts: Tools to help lock in behavior change and new habits.

Who Is This Book For?

The short answer: If you work, and you are human, it’s for you. However, it is particularly essential for:

  • Executives: Who must understand the impact of AI on employees and customers.
  • Working Professionals: Who are concerned about staying relevant as their industry transforms.
  • Managers: Who are tasked with leading their teams through unprecedented change.

The Research Behind the Program

This isn’t just theory. Paul Slater’s 90-day program is built on interviews with over 200 professionals who are sustainably effective with AI every day.

Slater draws on over 30 years at the intersection of advanced technology and personal development, including a decade at Microsoft leading global strategy and contributing to AI think tanks at Harvard, Duke, and Arizona State University.


About the Author: Paul Slater

Paul Slater helps professionals and organizations navigate the “human side” of AI transformation. As the host of the Humanity Working podcast and author of The AI-Ready Human, he focuses on what it actually takes to thrive as intelligent machines reshape our world.

Paul equips professionals to build the human capabilities AI can’t replace—judgment, adaptability, resilience, and meaningful connection.

A Proven Track Record

  • Microsoft Veteran: Spent nearly two decades leading global digital transformation and authoring over 20 books for senior technologists.
  • C-Suite Advisor: Has delivered briefings to Fortune 500 executives and national governments worldwide.
  • Entrepreneur: Co-founded BillionMinds (a Techstars company), creating programs to help employees thrive in the age of emerging tech.
  • Academic Contributor: Served on AI-focused think tanks at some of the world’s most prestigious universities.