Callum turns from fan to star in Fantastic Beasts sequel
A 10-year-old Callum Turner waited patiently atop the top bunk of his bunk bed for the letter to arrive.
Hopefully delivered by an owl, the letter would formally invite Chelsea Football Club-mad child to attend Hogwarts, the famous school of witchcraft and wizardry featured in Harry Potter.
The magic of J.K Rowling's masterpiece series was it was not only written for readers at Harry Potter's age, but the style of writing, the plot, and the character's attitudes, evolved and aged with the mostly teenaged audience.
While the letter never came, Turner's introduction to Hogwarts did less than two decades later.
The Fantastic Beasts newcomer will play Theseus Scamander, the war hero brother of lead character Newt (Eddie Redmayne), when Fantastic Beats 2: The Crimes of Grindelwald lands in cinemas on November 15.
Turner, who counts Sirius Black as his favourite character from the record-setting series ("I just loved how he was the anti-hero"), said the Harry Potter series changed his life.
"I whizzed through it at a time I wasn't reading at all, apart from a football magazine here or there," Turner said.
"I have this vivid memory of being on my bunk beb, the top bed, and just wishing an owl like Hedwig would come in and give me a letter to say I could go to Hogwarts but it never came. It had such a huge effect on me and it has the world over."
The same wizarding world could change the 28-year-old's life all over again.
Crimes of Grindelwald could be Turner's breakout role. A star of TV miniseries Glue and War and Peace, and with credits that include Assassin's Creed and Victor Frankenstein, this is the first time Turner has been part of a franchise.
After meetings with the casting director and auditions, Turner screen-tested alongside Redmayne.
The role was sealed with a kiss.
"We had a laugh, and I kissed him on the forehead and I think that's the reason I got the job," Turner said. "It was a bit out there to go for the kiss. It was on the forehead, it wasn't a romantic kiss."
Rather than be caught in the hype of working alongside established stars like Redmayne, Johnny Depp (Grindelwald), Jude Law (Albus Dumbledore) and Katherine Waterston (Tina Goldstein), he approached it with a different mentality.
"I pretended it was a small independent movie that nobody was going to see so I could do my job and, not that it would happen anyway, but to not let any fear creep in: just to concentrate on what's at hand," Turner said.
"It's been amazing to be welcomed in with open arms.
"Day one I was nervous but by the end of it I felt like I'd been part of the family all my life. These guys are wonderful, loving people, as well as extremely talented, so I felt really privileged."
Fantastic Beasts: The Crimes of Grindelwald opens in theatres on November 15.