NOTE: The following is a revised version of an article originally published on Medium, where I’ve published a number of writing advice pieces.

Warning: Contains spoilers for The Witches.

One of my as-yet-unpublished children’s novels is a very dark fairy tale. A horror story for children. The scariness envelope is deliberately pushed to the absolute limit.

I was intrigued to note the reaction from adult beta readers versus child beta readers. The adult readers were horrified, greatly disturbed by some of the imagery and events in my story, and insisted it was far too scary. By contrast, the child readers loved it, but also made some merciless criticisms, including that it wasn’t scary enough!

Writing children’s fiction is exceptionally tricky. My children’s novels are pitched at the Harry Potter/Alex Rider demographic, so they aren’t aimed at the very young. However, it becomes even trickier when generating a gripping, satisfying narrative around darker subject matter. When done well, it will engage child readers, and hopefully grown-up readers too — even if they find it more alarming.

Here are four important principles I follow in crafting dark children’s tales.

Don’t condescend

The worst thing to do to children is to talk down to them. Don’t be afraid of strategically including more advanced vocabulary. To quote JRR Tolkien:

“A good vocabulary is not acquired by reading books written according to some notion of the vocabulary of one’s age group. It comes from reading books above one.” — JRR Tolkien, The Letters of JRR Tolkien.

This is a principle that many modern schoolteachers seem unable to grasp, to my immense frustration. They have often refused permission for my children to read certain books considered above their reading level. When my children returned home and informed me of this, I would present them with my own copies. If they find words they don’t understand, they ask or look them up. Children should never be discouraged from reading above their ability level.

No subject matter off-limits

On a related note, I don’t believe any subject matter is inappropriate for children. It is the treatment of the subject, not the subject itself, that is important. Children’s fiction can be every bit as incisive, incendiary, challenging, and thought-provoking as grown-up fiction. Often more so.

Difficult subjects covered in children’s fiction include terminal illness and repressed guilt (A Monster Calls), racism and prejudice (Ghost Boys, To Kill a Mockingbird), the Holocaust (The Boy in the Striped Pajamas, Maus), autism (The Curious Incident of the Dog in the Night-Time), wrongful imprisonment (Holes), corrupt religious authority, abuse of power, and sexual awakening (His Dark Materials). Countless great children’s novels deal with death (Charlotte’s Web, Watership Down, the Harry Potter novels). The novels of Jacqueline Wilson cover everything from mental illness to adoption and divorce.

In the case of my own aforementioned novel, the plot concerns a thirteen-year-old girl in denial over her parent’s marital crisis, after she overhears a phone call between her father and what could be his mistress. Within the framework of the horror/dark fairy tale genre, the scary, supernatural events that ensue provide the protagonist a cathartic character arc that (I hope) resonates with any child of divorced parents, helping them come to terms with their situation.

Include material that isn’t necessarily PG-rated

When the subject matter calls for it, don’t be afraid to step outside the “PG-rated” envelope. Edgier content can be fully justified depending on the genre and context. For example, you might think the f-word has no place in a children’s story, but The Curious Incident of the Dog in the Night-Time proves otherwise. The placement of those words is hugely important regarding the consistent voice and character of Mark Haddon’s protagonist, Christopher Boone (and also the adults in that story who try not to swear, but are driven to out of frustration due to Christopher’s actions).

Some of the greatest children’s stories, from the Grimm fairy tales to the Goosebumps series, are scary and gruesome. In my experience, children are morbidly curious about gore, love to be scared, and should be allowed to explore frightening stories, rather than have their curiosity squashed. Yes, temperament, personality, and upbringing are complicating factors, but on the whole, I believe scary stories are good for children’s mental health. They are important childhood rites of passage.

Sometimes endings that are dark and cruel to adults make complete sense to children. As a child, I remember thinking the ending of Roald Dahl’s The Witches was perfect. After being turned into a mouse, the unnamed boy protagonist wonders how long mice live. After discovering it’s about as long as his beloved grandmother will live, he is quite content, as she is his only surviving family member after his parents died in a car crash, and he doesn’t want to outlive her in any case. This downbeat, melancholy conclusion only became more upsetting to me with age.

Sometimes a children’s story needs to be not merely scary but flat-out terrifying. Neil Gaiman’s Coraline is a case in point. The nightmarish buttons-for-eyes parallel universe is a vital crucible through which Coraline must journey, as she gradually learns to appreciate her own dull but decent parents. This is a moral lesson implied, rather than stated outright, which brings me to my final point.

Don’t preach

Editorialising, preaching, or consciously grinding the message axe is to be avoided in any work of fiction. In a children’s novel, multiply that factor by ten. The moment children detect a sanctimonious, finger-wagging authority figure telling them what they must do or think, for their own good, they switch off.

That isn’t to say moral messages can’t be included in children’s fiction. Indeed, certain children’s stories are practically hellfire sermons (Pinocchio for instance). But these messages must be inherent in the story, as in the example of Coraline.

There are rare exceptions. Roald Dahl’s Charlie and the Chocolate Factory is a good example, as it features spoiled children getting their just desserts, accompanied by amusing Oompa Loompa rhymes. But unless you have Dahl’s outrageous wit, inserting a po-faced moral message into a children’s novel is a guaranteed way to kill a potentially good story.

Conclusion: Remember the delirious thrill of being scared as a child

As a child, after reading The BFG, I had nightmares about giants snatching me from my bed and eating me alive. Yet I read it again and again and absolutely loved it. I was also thrilled by many other scary novels and movies (PG-rated films in those days could be a far more frightening experience, as anyone who saw Indiana Jones and the Temple of Doom at the cinema as a child will tell you).

Whilst writing scary stories for children, it is important to return to that mindset, when being scared was so much fun, even if it meant nightmares. It is also important to approach such writing with a smidgen of subversive glee, knowing you may incur the wrath of disapproving parents. But write them anyway. To quote Marty McFly in Back to the Future: “Your kids are gonna love it.”