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About The Book

From internationally bestselling author Daniel Kalla comes a riveting thriller about online body shaming, toxic diet pills, a vulnerable mega-celebrity, and a rapidly rising body count.

When Owen Galloway, the track star son of a prominent US senator, is found dead of an overdose in his bedroom, LAPD Detective Cari Garcia suspects that he’s just another teenager who hid a drug addiction.

In Vancouver, Dr. Julie Rees, an experienced toxicologist, notices a growing number of overdoses among the eating disordered and body builders, and mentions it to her boyfriend, Detective Anson Chen.

Then Rain Flynn, a famous pop star and social media influencer, dies in her Vancouver hotel room showing the same symptoms of a fatally high fever and uncontrollable seizures as Julie’s other ER patients, including the coowner of a wildly popular wellness center with locations in both Vancouver and LA.

After an autopsy confirms that Rain overdosed on illicit diet pills containing a deadly toxin known as DNP—an explosive agent originally used in the trenches of World War I—the media gets hold of the story and runs wild with it. But who’s behind the online marketing and distribution of DNP? And how is the wellness center connected? The daunting challenge of putting the pieces together falls to Detectives Garcia in LA and Chen in Vancouver. Can they solve these crimes before DNP becomes the next viral TikTok challenge?

About The Author

Michael Bednar Photography

Daniel Kalla is an internationally bestselling author of many novels, including Fit to Die, The Darkness in the Light, Lost Immunity, The Last High, and We All Fall Down. Kalla practices emergency medicine in Vancouver, British Columbia. Visit him at or follow him on Twitter @DanielKalla.

Product Details

  • Publisher: Simon & Schuster (May 9, 2023)
  • Length: 320 pages
  • ISBN13: 9781982191436

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Raves and Reviews

“Enthralling . . . a propulsive suspense, one that raises awareness about a very real, very frightening drug, while also entertaining his captive audience. A feat that only an author of Kalla’s caliber could accomplish.”
SAMANTHA M. BAILEY, USA Today and #1 bestselling author of Watch Out for Her and Woman on the Edge

“A compulsive, fast-paced thriller that'll keep you flipping those pages well into the night. Filled with twists, turns, and shocking revelations about the diet industry, this is one heck of an intriguing must-read. I devoured it (guilt-free).”
HANNAH MARY McKINNON, internationally bestselling author of Never Coming Home

“Combines a timely plot with a well-paced thriller I became addicted to—fast. This is a gripping page-turner crafted by a skilled, intelligent writer.”
MARISSA STAPLEY, New York Times bestselling author of Lucky

“This is one of Kalla’s best.”
The Globe and Mail

“[T]imely and relevant. Exposing the dark side of the wellness industry, this electrifying, ripped-from-the-headlines thriller will keep your heart racing from the first page to the very last.”
JENNIFER HILLIER, USA Today bestselling author of Things We Do in the Dark

“I love all of Kalla’s thrillers, but Fit to Die offers his most unique premise yet. . . . [A] riveting mystery about a deadly weight-loss drug that kills indiscriminately. With skill and empathy, Kalla presents multiple perspectives—the victims, the villains, those who help them, and those who hunt them—and keeps the twists and turns coming until the very last page. I couldn’t put it down!”
ROBYN HARDING, bestselling author of The Drowning Woman

“Tight and tense with great dialogue and snapshot descriptions that crank up the believable. Daniel Kalla is one hell of a writer, and Fit to Die is one hell of a thriller.”
DIETRICH KALTEIS, award-winning author of Under an Outlaw Moon

“Kalla’s characters are well-developed across the board, be they victims, heroes, or the long list of suspects. The original and twisty plot helps this taut thriller stand apart.”
Publishers Weekly

“Once again, Kalla demonstrates his ability to focus his lens squarely on hot topics.”
Vancouver Sun

“[A] timely and relevant story.”
The Miramichi Reader

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