The briefing room has seen murder boards, autopsy photos and serial killers’ letters. This afternoon it gets a lasagna and a slideshow. Cassie’s grandmother has commandeered the screen to present her case: exhibit one is a ball of dough two FBI agents kneaded together at Thanksgiving, exhibit two is a red onion sliced down the middle, and the last slide reads only five days. She wants the agents engaged by Christmas Eve, and she wants the teenagers who profile killers for a living to find out what is stopping one of them. Dangerous Impulses by Jennifer Lynn Barnes begins as a comedy of meddling and becomes something more searching: a study of why some people cannot let themselves have the thing they want.
A First Christmas After Catastrophe
Readers of the first four books know what Cassie Hobbes carries into this December, and Barnes does not pretend it has healed. Nightmares come two or three times a week. A forest walk to choose a Christmas tree drags her back to being hunted. A colour or a sound can send her into a flashback, and she and Dean have built a small private ritual to pull each other back. These passages are unshowy and exact, and they give the comedy around them a floor to stand on.
The heart of the novel, though, is Laurel, the four-year-old half sister who was raised among monsters and is now learning, slowly, to play. Her deadpan interrogations of mall elves are very funny. Her quieter moments, a child working out that people are not toys, or what she might be asking Santa for, are the most affecting scenes Barnes has written in this series. Dangerous Impulses by Jennifer Lynn Barnes understands that a child’s recovery is made of tiny, unremarkable victories, and it lets each one land.
The Mentors Become the Mystery
The matchmaking plot pays off because it treats Agent Sterling and Director Briggs as people with histories rather than obstacles. The teenagers reconstruct the couple from evidence: a worn notebook in which two little girls once planned escapes from absurd worst-case scenarios, a memory of a midnight that changed everything, a quiet admission from Briggs that trauma in their line of work piles up like snow along a road that never fully melts. Judd, the gruff ex-sniper who has raised more than one of these children, becomes a reluctant witness. Michael and Lia, meanwhile, are at war with each other in a way that is both maddening and plainly lovesick, and Sloane’s romance with Celine unfolds through a roll down a snowy hill that is pure delight.
The novel’s handling of all this is not flawless. The friends’ snooping goes well past mischief, and the book treats it as a prank with only a mild reckoning. Some motifs, particularly the onion that Nonna introduces in chapter two, return so often that they lose their charm.
What redeems the excess is Sterling herself. She is a profiler too, older and warier than her pupils, and the book has fun with the fact that she can see them coming. Her patience, her flashes of temper and her refusal to be managed make her the most fully drawn adult Barnes has written. Dangerous Impulses by Jennifer Lynn Barnes spends real time on what she lost as a girl and what she is protecting now, and when the reason behind her refusal finally comes into view, it says something about the whole found family rather than just one romance. Briggs, long the stiffest figure in these books, gets a dry sense of humour and a stubbornness that turns out to be devotion. Dean, the quiet centre of Cassie’s life, carries a private guilt about the couple’s divorce that gives the matchmaking a sharper edge than its sleigh-ride trappings suggest. Even the meddling grandmother, who could have been a stock comic Italian matriarch, is allowed a flicker of regret for the years of a granddaughter’s childhood she missed.
What Dangerous Impulses by Jennifer Lynn Barnes Hides in the Snow
Running beneath the holiday plot is a cold case unlike most in YA crime. A runaway who died of natural causes was found washed, combed and arranged in the snow, and each year since, during the week before Christmas, something similar has happened somewhere in the West. The two profilers take turns speaking as him, addressing him as “you” and answering in his voice, a method that reads almost like a duet, while brief interludes put the reader inside his head. The solution, when it arrives, turns on loss and survivor guilt rather than cruelty, and it rhymes with Cassie’s own story in a way that makes the book feel whole.
It is still the slenderest investigation in the series. Much of the progress comes from Sloane’s software rather than anyone in peril, and the climax is reported rather than lived. Anyone hoping for the dread of the earlier novels should know that Dangerous Impulses by Jennifer Lynn Barnes chooses mercy over menace. Violence stays mostly in photographs and the past, though readers should be prepared for suicidal ideation, animal death, childhood trauma and grief; romance never goes beyond kissing.
Jennifer Lynn Barnes Comes Home
Barnes left the Naturals after Bad Blood in 2016 and a short e-novella the following year, and she spent the decade since becoming one of the biggest names in young adult fiction. She has published more than twenty-five novels, is a Fulbright scholar, and has taught psychology and professional writing at the University of Oklahoma, which may explain why her profilers sound like they have actually read the literature. Her acknowledgments credit readers’ enthusiasm for bringing her back to this world and promise more to come.
That history shapes the book. The fifth novel is set just months after the fourth, so the decade’s gap is invisible on the page, but a returning writer’s affection is everywhere. Fans of her more recent work will recognise the rhythm of the group scenes from The Gilded Blade, where the same skill with rival personalities in one room is put to work in a puzzle game. Here it serves a family instead.
Who Should Open It
Dangerous Impulses by Jennifer Lynn Barnes is for readers who already know these characters; it spoils earlier books freely and depends on them for its emotional weight. Those readers, especially ones who loved the team more than the killings, will find it a generous reunion. For a seasonal pairing, Kill Joy by Holly Jackson offers a lighter festive murder game with a similarly clever teenage sleuth, and Barnes’s own puzzle books suit anyone who wants the banter with higher stakes.
What It Leaves Behind
The novel, out now from Little, Brown Books for Young Readers, does not end on a body. It ends on a crowded family table and a small child deciding that what she sees is real. That is a strange place for a crime series to land, and exactly the right one for this book. Dangerous Impulses by Jennifer Lynn Barnes is soft where its predecessors were sharp, and for anyone who has followed Cassie through the dark, that softness is its own kind of payoff.