Killer Instinct by Jennifer Lynn Barnes

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🔪 Killer Instinct by Jennifer Lynn Barnes – Book Review ⭐⭐⭐⭐⭐

Oh YES. We are back with the FBI’s favorite group of emotionally traumatized teenage profilers and I am eating it up. 🍿

If you loved The Naturals, buckle up — because Killer Instinct cranks the danger level up to “why are we letting minors do this again?” and somehow makes it even more addictive.

This series is officially my guilty pleasure in the best possible way.

⚠️ Content & Trigger Warnings

Before we dive into the blood-spattered forest:

  • Graphic violence

  • Murder (including child victims)

  • Child death

  • Emotional & physical abuse

  • Child abuse

  • Serial killer themes

  • Kidnapping

  • Psychological manipulation

This one is darker than Book 1. The stakes? HIGH. The body count? Also high. 😬

📚 Overview of Killer Instinct

Published in 2014, Killer Instinct is the second book in The Naturals series by Jennifer Lynn Barnes.

The series follows Cassie Hobbes, a teenager with an uncanny ability to profile people, recruited by the FBI into a secret program for gifted teens — alongside Dean (the broody one), Michael (the charming one), Lia (the human lie detector), and Sloane (the stats genius).

This time? The murders mimic those committed by Daniel Redding — Dean’s imprisoned serial killer father.

Yes. We’re going there. 😌

🚨 SPOILER WARNING 🚨

Full plot. Full ending. No holding back. If you haven’t read this yet, turn back now.

🔎 Full Plot Summary (With All the Twists)

We pick up shortly after the events of The Naturals, where Cassie discovered her beloved aunt was secretly a serial killer. Casual teen problems.

The Naturals have just helped rescue a missing girl, Mackenzie McBride, and are celebrating when they’re interrupted by their new supervisor: Special Agent Veronica Sterling — the FBI director’s daughter.

She is strict. She is unimpressed. She basically tells them to sit down, do homework, and take GED practice tests instead of chasing murderers. The audacity. 😑

🩸 Murder #1 – Copycat Crimes Begin

A young girl, Emerson Cole, is found murdered on a university campus. The killing mirrors the MO of Daniel Redding — Dean’s father.

This hits Dean HARD. And honestly? It should. Imagine your dad being the blueprint for murder.

We learn more about Dean’s past:

  • Redding encouraged Dean to participate in killings.

  • Sterling and Dean escaped Redding together years ago.

  • The Naturals program was created partly because of Dean’s trauma.

Talk about generational baggage.

🧠 The Frat Party Investigation

Lia convinces Cassie and Michael to investigate secretly at a frat party (because nothing screams safe like teens infiltrating potential serial killers 🙃).

They meet:

  • Geoffrey, a TA obsessed with Redding.

  • Clark, suspicious student.

  • Derek, another student acting shady.

Meanwhile, Professor Fogle, who teaches about serial killers, seems connected.

The FBI interviews Redding in prison. He’ll only talk to Dean. Cassie watches from an observation room, where Redding drops hints about Fogle’s cabin and mentions a student writing to him.

Red flag city.

🏚️ Murder #2 – The Professor Dies

Fogle is found dead in his remote cabin.

At this point, every suspect the Naturals identify ends up dead shortly afterward.

I’ll admit… it gets almost comically convenient.
“Oh you think it’s him?”
Boom. Dead.

It’s a little silly. But it’s FUN silly. The pacing never slows. 🔥

🧩 The Apprentices Twist

Redding has been orchestrating murders from prison.

And here’s where we hit the “kill for each other” trope — yes, the Strangers on a Train concept. Two killers murder each other’s victims to avoid direct motive.

I’m getting a little tired of that trope, not going to lie. #iykyk. But thankfully it’s not the whole twist.

The Naturals realize there are two apprentices, each killing the other’s victim.

  • Christopher Simms (Trina’s creepy son) is one.

  • Clark is another.

Clark is murdered before the FBI can grab him.
Christopher is arrested just before attacking again.

Case closed?

Of course not. We’re only 80% through the book.

😳 The Third Apprentice Reveal

Cassie realizes the pattern doesn’t fully fit. There has to be a third apprentice.

And guess who it is?

Webber. The prison guard.

The man who insisted on checking Cassie and Sterling’s credentials earlier.

He abducts Cassie and Sterling.

But here’s where it gets chilling:
Webber has evolved beyond Redding’s MO. He wants to hunt Cassie.

He releases her in the woods and literally chases her like prey.

It’s horrifying. It’s intense. It’s peak YA thriller energy.

Cassie fights back, but Webber overpowers her.

At the last possible second, Briggs and Dean arrive. Briggs shoots Webber.

Cassie survives.

💋 The Romance (Because Yes Please)

After all that trauma and attempted murder?

Dean and Cassie finally kiss.

And I love this love triangle so much. Dean’s darkness vs. Michael’s charm? I’m entertained. I’m invested. I’m not choosing sides yet. 😌

🏠 Ending & What’s Next

  • Sterling moves into the Naturals’ house.

  • The program is officially allowed to work active cases.

  • Cassie continues investigating her mother’s disappearance.

The stage is set for Book 3.

And I am READY.

💭 My Thoughts

Is it realistic that every suspect conveniently dies? No.
Is it slightly over-the-top? Yes.
Did I care? Absolutely not. 😂

This book is:

  • Fast-paced

  • Dramatic

  • Twisty

  • Emotionally messy

  • Addicting

The themes of trauma, nature vs nurture, and found family really shine here.

And even though I’m mildly exhausted by the “kill for each other” trope, it didn’t dominate the final reveal, which saved it for me.

This series is the definition of “suspend disbelief and enjoy the ride.”

🔥 Final Rating: ⭐⭐⭐⭐⭐ (5/5 Stars)

High stakes. Serial killer apprentices. Forest chase scenes. A kiss at the end.

What more could I want?

📖 If You Loved This, Try:

Okay but tell me — are you Team Dean or Team Michael?? 👀

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