Case Active

Every week, a new
murder to solve.

AI-generated case files delivered to your screen. Witness statements. Forensic reports. Suspect profiles. Red herrings. One killer. You figure out who.

Open Case Files → Generate a Mystery
∞ Unique Cases
0 Boxes to Ship
1 Killer per Case
What You Get

A complete case file.
Not a chatbot.

Each week, ColdFile delivers a full investigation package. Read the evidence. Cross-reference the statements. Spot the inconsistencies. Build your theory. Reveal the answer when you're ready.

The Harborside Arrangement
Difficulty: Hard
Est. solve time: 45 min
Witness Statement
"I heard the front door at 11:40. I know because the news had just ended. But Marcus said he was home all night."
Forensic Report
Traces of saltwater residue found on victim's shoes. Nearest coast: 12 miles from the reported location of death.
Phone Records
Three calls to an unregistered number between 9:15 PM and 10:02 PM. Each lasting under 30 seconds.
MH
Marcus Harlow Husband
DP
Diana Price Business Partner
TK
Thomas Kearns Neighbor
How It Works

Three steps. One killer.

01

Open Your Case

Every week, a new AI-generated murder mystery lands in your dashboard. Complete with evidence, suspects, and enough red herrings to keep you guessing.

02

Investigate

Read witness statements. Cross-reference timelines. Check alibis against forensic evidence. Take notes. Build your theory at your own pace.

03

Solve It

Name your suspect, their method, and their motive. Reveal the full solution when you're ready. See how your deduction compares.

Physical Mystery Boxes

× $30/month for one case
× Wait weeks for shipping
× Same case for everyone
× Limited by physical production
× Can't replay or share

ColdFile

→ New case every week
→ Instant delivery, solve anytime
→ Every case is unique
→ Infinite mysteries, AI-generated
→ Difficulty adapts to you

The case is open.
The evidence is waiting.

73 million Americans listen to true crime podcasts. They consume stories. ColdFile lets them live one. Every week, a new murder. Every week, a new chance to prove you would have caught the killer.

Start Investigating →