The Wolves of Mercy Falls is a series of four novels, located in the genres of romance, fantasy and young adult (YA) fiction, written by Maggie Stiefvater.

[3] The novels largely follow the relationship of Grace Brisbane and Samuel K. “Sam” Roth, as tensions between humans and wolves/werewolves rise throughout the small town of Mercy Falls, in the wake of the attack of a school boy.

The second book, Linger (2010), includes the perspectives of Isabel Culpeper and Cole St Clair, alongside those of Grace and Sam.

The final book in the Shiver Trilogy, Forever (2011), is written from Grace, Sam, Isabel and Cole's perspectives, with a small chapter of prologue from a werewolf named Shelby.

The fourth addition to The Wolves of Mercy Falls series, titled Sinner (2014), is a standalone book which closely follows the characters of Isabel Culpeper and Cole St Clair, set in the Southern California city of Los Angeles, as told from the perspectives of Isabel and Cole.

[5] Stiefvater's Shiver remained on The New York Times (NYT) bestseller list for over 32 weeks in 2009, selling 130,996 copies.

[8] Shiver begins against the backdrop of winter, with the character of Grace Brisbane at age 11, who has been pulled from her backyard tire swing by a pack of wolves.

Saved from their attack by a yellow-eyed wolf, the 6 years following consist of Grace routinely watching the edge of the woods behind her house in search of her saviour – he returns her gaze every winter.

The perspective of the novel alternates between Grace and the yellow-eyed werewolf, Samuel K. “Sam” Roth, who only transforms over the duration of winter and spends his summers working at a local bookstore.

The death of Jack Culpeper, a student at Grace's school, spreads terror throughout the small community of Mercy Falls, as it is suspected that he has been killed by the wolves.

This leads to the decision to hunt them, with Grace's attempt to deter the shooters resulting in her discovery of Sam, except now in human form.

Sam explains to her that his healing abilities are a side-effect of being a werewolf, prompting them to escape before the doctors discover him awake and with no visible wound.

Grace invites Sam to stay at her house following these events, who reluctantly agrees to sleep in her room, as they decide to hide his presence from her parents.

Grace comes to the conclusion that nearly dying from heat stroke as a child cured her, as Isabel suggests that the same effect could be mirrored by injecting Sam and Jack with meningitis.

After not seeing Sam for months, Grace finally finds him appearing at the edge of the woods behind her house, shockingly in human form.

Sam is interrogated by Officer Koenig as he is the suspect to be behind the death and possible rape (as she was found naked) of Olivia, and Grace's disappearance.

Their date is interrupted by a phone call from Baby, informing him that preparations have been made to host the auditions on the beach, as he had requested.

After the auditions have finished, Cole unsuccessful in his search of a new bassist, Jeremy finally agrees to join NARKOTIKA again.

Baby's attempts to sabotage him fall short, as Isabel and his secret transformations into a wolf help him maintain his sanity and sobriety.

Isabel injects him with bacterial meningitis as a possible cure to control his body temperature and keep him human, and though it works, he feels guilty that Grace is going through the same thing.

When the wolves are under threat, he is injected so that he can turn into a wolf again to help move them into a safer location, though he ends the series as a human.

He has a dark mop of hair and yellow eyes; Cole describes him as being a yellow-eyed John Lennon and Grace thinks he looks everything but nothing like his wolf form at the same time.

Grace says that Isabel has is very good looking, typical of a Culpeper, and Cole describes her as being drop dead gorgeous the first time he sees her.

She has blue eyes and blonde hair, though her long ringlets are cut short and jagged at the start of Linger.

He survives the transformation, but Victor is shot and killed in his wolf form, and Cole carries the guilt with him into "Forever" and "Sinner".

She had white blonde hair and Grace called her "beautiful with deep, soulful eyes"; she also has a strong southern accent as a human.

Shiver had been considered for film adaptation by Paramount Pictures, although creative differences meant the project was not continued.

[9] In March 2023, Andy Fickman was hired to direct the film, with Addam Bramich and Betsy Sullenger serving as producers.

[10] However, in September 2024, Claire McCarthy was hired to direct, replacing Fickman as director, from a script she co-wrote with Maggie and Jett Tattersall.

[11] In November 2024, Maddie Ziegler and Levi Miller were cast in the lead roles, with filming commencing in Vancouver that month.