Callum Denham

"I’m not a witch, Lee. You keep helping me, and for what? There aren’t books about me like there are for you. The only thing they have about my species in Atlantis is their record of known Lycans. I’m not even on it! I don’t know what the hell I’m doing! I don’t know shit!"

- Callum talking to Lee Callum Denham is the brother to Reg. He is a Lycan, which was kept as a secret at the Academy for over ten years. He is one of the main POV characters in A Sacrifice for Salem and eventually becomes an unofficial member of the Salem Four due to his part in the Battle for Salem.

Pre-ASFS
Reg and the baby Callum were abandoned at the gates of the Academy by their parents. As such, Callum has known no life outside the walls of the Academy. When he began his studies, Callum soon became friends with Florence Gale. At some point, Damian Prescott learned of Callum's Lycanthropy and used this as blackmail for him to do all his work for him.

ASFS
At the beginning of the novel, Callum's Lycanthropy is exposed by Damian as he failed to do his work for him. This sends Reg into a fit of anger, leading to their confrontation.

When Mary arrives at the Academy, she and Callum become friends, but he is unable to help her in her escape. This leads to Callum feeling guilty and helping Reg and Ash bring her back, Florence in tow. On their way back to the Academy, however, they encounter a Lycan which later turns out to be Hamilton. The two Lycans fight, leading to Callum being almost mortally wounded. He then falls into a coma for about a week, being healed by Lee.

As he and Lee grow closer, Callum insists that he has to go to Salem to help the other members of the Salem Four. Lee manages to convince him to get help from Damian and the three of them devise a plan to escape the academy and catch a flight to Salem. This mostly goes as planned, but when Ashley West comes close to finding them before they can get on the plane, Lee volunteers to be left behind and distract her long enough for them to get away. She kisses Callum before they leave.

When Damian and Callum finally arrive at Salem, the two of them find the city virtually deserted, a result of Cassandra's influence. They do notice Mary being taken by Hamilton to Salem Common but decide to wait for the others. When they arrive, they head to the Common and stop Mary's sacrifice from happening. Callum once more fights Hamilton, defeating him and causing him to flee. When Florence is subsequently shot by Marcus, Callum joins the fight to stop Beatrice from resurrecting the Witches of Old Salem.

Following Florence's death and the disappearance of her body, Callum reluctantly returns to the academy, heartbroken. He does not stay long and in the night, disappears, presumably to return to Salem and search for her lost friend's corpse.

Lycanthropy
Callum is a Lycan, meaning that he can willingly change his form into that of an enormous, bipedal wolf with enhanced strength.

Reg
Callum initially appears to be the only person Reg shows any affection towards. The two brothers have a close relationship and are distressed whenever they think something may happen to the other. It is the possibility of not being able to help his brother that inspires Callum to go to Salem.

Florence
Florence and Callum are best friends. The two have a close relationship at the beginning of the novel that only grows as they talk to each other over the phone throughout the Salem Four's trip. Despite Callum not reciprocating his feelings for Florence, the two remain friends until the latter's death, in which Callum shows high levels of distress.

Mary
Callum and Mary become fast friends, much to Florence's initial chagrin. He initially helps her in her quest to see Fred's grave. On the trip to Salem, they do not interact much, but Mary is much happier to see him when he arrives with Damian to help fight.

Ash
Ash and Callum do not interact much, but when they do, they appear to have good chemistry and produce a solid friendship.

Lee
Lee and Callum's relationship grows after their first meeting. She can sense his pain and appears to seek to alleviate some of it. She provides him with counsel and gives him help in his time of need. At some point, the two develop crushes on each other resulting in her kissing him before he escapes to go to Salem. By the time he gets back, however, Florence has been killed and Callum becomes distant.

Damian
For years prior to the events of the novel, Damian bullied Callum into doing work for him, threatening to expose him for his Lycanthropy. This resulted in a hatred for Damian that made Callum initially hesitant to ask for his help in going to Salem. When he did, however, the two grew closer and formed a tenuous friendship.

Trivia

 * Callum was originally going to accompany Mary, Reg, Ash, and Florence to Salem, but upon including the Lycan fight, it was deemed that he would stay in the UK for a while longer in order to communicate what was happening while the others travelled.
 * Callum was originally meant to be the "Sacrifice for Salem", with him dying in Florence's place at the end of the novel.
 * With him helping the others at Salem, Callum becomes an unofficial member of the Salem Four, along with Damian.
 * Callum has blonde hair, while Reg has black hair.