Chapter 70: The Mailbox Mystery Solved
The stairwell smells like cleaning solution and old carpet.
Penny and I are wedged between floors, watching the mailbox alcove through the railing. 10:47 PM. Wednesday night.
"This is ridiculous," she whispers.
"This was your idea."
"I know. That's why it's ridiculous."
We've staked out the mailboxes four times since the mystery started in July. Never caught anyone. Never saw anything.
But the comics keep appearing. One per week. Always perfect for Penny's developing interests. Always from my shop's inventory.
"Maybe it's a ghost," I suggest.
"Ghosts don't leave comics."
"How do you know? Have you asked a ghost?"
"Shut up."
10:58 PM. Nothing.
11:03 PM. Still nothing.
11:07 PM—
Footsteps.
Penny grabs my arm. We go silent.
Sheldon Cooper walks into the alcove carrying a paper bag.
"You have got to be kidding me," Penny breathes.
Sheldon pulls out a comic. Studies Penny's mailbox. Places the comic inside carefully. Pulls out a small notebook. Makes a note. Returns notebook to pocket.
"Now," I whisper.
We emerge from the stairwell.
"Sheldon."
He turns. Not startled. Just—curious.
"Stuart. Penny. Good evening."
"What are you doing?" Penny asks.
"Leaving a comic in your mailbox. Obviously."
"WHY are you leaving comics in my mailbox?"
"Relationship research." He says it like this explains everything.
"Relationship research," I repeat.
"Yes. I've been conducting a longitudinal study on the effects of shared cultural immersion on romantic pair-bonding." He pulls out the notebook. "You two began dating in April. I hypothesized that introducing Penny to Stuart's primary interest—comics—through carefully curated recommendations would strengthen relationship cohesion."
"You've been studying us," Penny says slowly.
"With a robust methodology. I've been tracking variables: time spent together, reported relationship satisfaction, integration into friend group, conflict frequency. The results are quite promising."
"Promising how?"
"Your relationship stability has increased thirty-seven percent since I began the intervention. Conflict events have decreased by forty-two percent. Penny's comfort level with the friend group improved fifty-three percent."
"Sheldon—" I'm trying not to laugh. "—how are you measuring this?"
"Observation, primarily. With quarterly surveys disguised as casual conversation. And Amy's been providing secondary data analysis."
"Amy knows about this?"
"She's a co-investigator. Obviously."
Penny's staring at him. "You've been leaving me comics for five months to study our relationship."
"Yes."
"That's—" She pauses. "—actually kind of sweet?"
"Science is frequently mischaracterized as cold when it's actually quite caring."
"Did you pick good comics?" she asks.
"Excellent comics. Each selection matched your developing sophistication in the medium. Early recommendations were straightforward—Wonder Woman, Ms. Marvel. Recent selections have been more complex—Sandman, Saga."
"I loved those."
"I know. I tracked your reading completion times and overheard you discussing them with Stuart." He closes the notebook. "The intervention has been successful. You've become genuinely interested in comics rather than merely tolerating Stuart's passion. This suggests authentic compatibility rather than performative relationship maintenance."
"So you were helping us?"
"I was conducting science. The helping was a secondary benefit."
Penny hugs him.
Sheldon freezes. "Physical contact was not part of the experimental design."
"Too bad. You're getting hugged."
"This is—" He's awkward. Uncomfortable. But not pulling away. "—acceptable."
She releases him. "Thank you. For caring. In your weird way."
"You're welcome. In my weird way." He adjusts his bag. "I should note—my research suggests you two have a ninety-two percent compatibility rating. That's exceptionally high."
"What about the other eight percent?" I ask.
"Statistical noise. No couple is perfectly compatible. But you two are—" He struggles for the word. "—good together."
"Thanks Sheldon."
"You're welcome. Now if you'll excuse me, I need to enter tonight's data before sleep."
He leaves. Penny and I stand in the mailbox alcove.
"Five months of mystery," she says. "And it was Sheldon running social experiments."
"Of course it was."
"I can't decide if that's creepy or adorable."
"Both. Simultaneously."
She pulls out the comic he just left. Fables #1.
"Have you read this?" she asks.
"Yeah. It's good. Fairy tales in modern world. You'll like it."
"Because Sheldon's algorithm says I will?"
"Because I know you. Algorithm's just confirming."
We head upstairs. The mystery's solved. The comics will probably keep coming—Sheldon's invested in his data now.
"Stuart?"
"Yeah?"
"We have good friends."
"We really do."
"Weird friends. But good."
"The best kind."
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