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The Missing Variable

Summary:

Five years ago, Dr. Spencer Reid lost the love of his life.

Since then, his world has become painfully simple: work, his daughter Daisy, and the people he’d do anything to protect.

When a new profiler joins the BAU, getting close to Spencer Reid is the last thing on her mind. He’s brilliant, guarded, and carrying the kind of grief that never truly leaves.

She doesn’t expect a curious little girl who lives three houses down to become a part of her daily life.

She doesn’t expect the BAU to feel like home.

And she certainly doesn’t expect to become the one variable Spencer never accounted for.

But some equations are never as complete as they seem.

Or, five years after losing everything, Spencer Reid learns that moving forward doesn’t mean leaving the past behind.

Also published on wattpad with the same title 🙏🏻

Chapter 1: prologue

Notes:

I chose The Missing Variable as a title because Spencer has always believed that everything can be understood if you have enough information. Every equation has an answer. Every profile has a pattern. Every mystery has a missing piece waiting to be found.
After his wife’s death, he convinced himself that his life had become painfully simple: work, Daisy, survive, repeat.
The equation was complete.
Or so he thought.
He never realized there was still one variable missing, not someone to replace what he had lost, but someone capable of changing the outcome entirely.
This story isn’t about replacing a love.
It’s about discovering that life can still surprise you, even after you’ve stopped looking for the answer.

I want to dedicate this story to a very important friend of mine, V., who can understand what it means to lose someone you love deeply and then learning how to live and love again.

English isn’t my first language so please if you notice any error let me know! Thanks. <3

Chapter Text

Five Years Earlier

 

Daisy Reid was four years old when she learned that adults could cry without making a sound.

She had always thought crying was loud, like when she scraped her knee at the playground, or when she dropped her favorite book in a puddle and thought it was ruined forever.

But the adults at her mother’s funeral didn’t cry like that.

They stood quietly, holding hands.

They looked at her father like they were afraid he might break if they looked away.

Daisy didn’t understand why everyone kept telling her how brave she was.

She wasn’t brave, she was just waiting for her mother to come home.

She still had her mom’s favorite cardigan hanging on the back of a chair in their living room. She still had the book she had been reading to her before bed. She still had a thousand questions she hadn’t gotten answers to.

Four year olds were not supposed to understand forever.

But Daisy Reid had always been different, she noticed things.

She noticed that Uncle Derek stopped making jokes, that Auntie Penelope cried whenever she looked at old pictures.
She noticed that Uncle Rossi brought food to their house every Sunday, even when no one asked him to.

And mostly, she noticed her father.

That was the thing nobody else seemed to notice.

Everyone kept telling Spencer Reid how strong he was, how amazing of a job he was doing, that Abigail would be proud of him.

But Daisy knew the truth, she knew that her daddy wasn’t strong.

He was just really good at pretending.

She sat beside him during the service, her tiny hand wrapped around his fingers.

He hadn’t let go of her once.

Not even once.

“Daddy?”

Spencer looked down at her.

His eyes were tired and there were shadows underneath them that made him look older.

“Yes, sweetheart?”

“When is Mommy coming back?”

For a moment, the smartest man in the room had no answer.

No statistic.

No fact.

No explanation that could make the world make sense again.

So he did the only thing he could: he pulled his daughter closer and whispered the only truth he had left.

“She isn’t.”

Daisy stared at him and nodded.
Even at four years old, she understood something most people never learned: sometimes the hardest truths were the ones nobody wanted to say out loud.

 

Five years later, someone new would walk into the BAU. Spencer Reid had no idea that the equation he had spent years trying to survive was still missing one variable.