For Anyone Who Likes Their Mysteries With a Little Atmosphere

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For Anyone Who Likes Their Mysteries With a Little Atmosphere *

Step into The Evidence Room, a series of interactive cold case mystery books filled with missing files, evidence, clues, timelines, and investigator-style prompts.

The Evidence Room is a series of vintage-inspired interactive mystery books filled with cold case files, clues, timelines, missing persons investigations, and the sort of details that make you lean in a little closer.

Each case invites you to read between the lines, review the evidence, follow the trail, and indulge your inner investigator for a while—because being nosy is far more respectable when there is a file involved.

A little suspicion looks good on you.

If you’ve ever wanted to look through someone else’s file, this is your moment.

Start The Case

The Evidence Room

Cold case mystery books, missing files, clues, timelines, and investigator-style prompts for readers who like to examine the evidence themselves.

Evidence Room

Solve It: Cold Case Missing Files Case No. 1973

The year is 1973, and the missing files have been reopened. Step into a vintage-inspired cold case investigation filled with vanished travelers, abandoned clues, open leads, and the unsettling question every file leaves behind: what really happened?

Start the Investigation

For readers who like their mysteries cold, their clues scattered, and their instincts slightly dramatic.

New Releases

Matters of Consequence: The Complete Society Edition Scandals, Secrets, and Strategies for the Discerning Conversationalist

A complete Regency scenario collection of secrets, rivalries, scandals, house party intrigue, and social strategy, where every choice may protect a reputation, ruin a season, or make a legend.

Matters of Consequence: A Parlor Game of Regency Secrets, Rivalries, and Reckonings

A Regency scenario book of secrets, rivalries, whispered scandals, and social reckonings where every choice may protect a reputation, destroy an alliance, or turn one misstep into legend.

Matters of Consequence A Drawing Room Diversion for Regency House Party Scandals and Secrets

A Regency scenario book of house party scandals, whispered secrets, dangerous flirtations, and social choices where one wrong word can ruin a reputation or make a legend.

Matters of Consequence What Would You Do? Cold War Scenarios of Strategy and Espionage

A Cold War scenario book where every decision carries risk, every alliance feels uncertain, and every answer reveals what kind of operative you might have been.

Matters of Consequence What Would You Do? Scenarios of Duty and Survival in WWII

A World War II scenario book where every choice carries weight, every duty has a cost, and survival may depend on what you are willing to risk, protect, or leave behind.

The Library

New releases and recent arrivals from Hidden Signal Media, freshly filed for anyone ready to open the next book.

The Evidence Locker

A tucked-away collection of bonus pages, extras, printable materials, and suspiciously interesting things that did not fit neatly inside the books.

The Hidden Archive

The WWII Challenge: Safehouse or Trap?

A downed airman reaches a cottage with blue shutters in occupied France. The signal cloth is missing. The password almost works. With a vehicle approaching on the road, he must decide whether the house is shelter or a trap already closing around him.

The Regency Ballroom: Miss Evelina Hartwell

A letter appears where it should not be: tucked inside Miss Evelina Hartwell’s reticule after a private card party in Bath. The difficulty is that Mr. Laurence Ashford is already expected to marry another lady, a match arranged as much for money as for love.

The Helsinki Envelope: A Cold War Dilemma in Prague

A Czech academic carries a list of dissidents hidden inside a book of poetry. It may save lives. It may expose everyone involved. In 1978 Prague, an embassy officer must decide how not to risk turning a literary evening into an international incident.

What Would You Do? in WWII: Prison Walls

In February 1944, RAF Mosquito bombers struck Amiens Prison in a daring attempt to free Resistance prisoners before execution or deportation. But rescue came with a terrible risk: the bombs meant to save them could also kill them.

Which Cold War City Matches Your Personality?

A bonus personality quiz from the Hidden Archive for readers of Proof & Consequence: Cold War Edition, where ten suspiciously stylish questions reveal which Cold War city matches your personality. No passport, trench coat, or security clearance required.

Case No. 1978-08: The Hidden Cove

An extra cold case file connected to Solve It: Cold Case Missing Files Case No. 1973, featuring The Hidden Cove, a fictional mystery of scattered statements, coastal secrets, and one disappearance that refuses to settle quietly.

A Few Extra Chinoiserie Dreams, Darling

A few extra printable coloring pages from Petals & Pagodas, Darling, filled with peonies, porcelain, bamboo, garden views, and elegant little creatures who clearly understand the importance of being decorative.

A Few Extra Sparkling Pages, Darling

A few extra printable coloring pages from Sparkle, Darling and Cheers, Darling, filled with festive little luxuries, sparkling details, glamorous gifts, holiday creatures, and just enough shine to make staying in feel fabulous.

Follow Another Lead

If the Evidence Room pulled you in, explore more Scene & Society series filled with vintage atmosphere, puzzles, travel, glamour, and beautifully suspicious little diversions.

Scene & Society

Play This Scene, Darling: A Valentine Puzzle Scrapbook from the Silver Screen

A Valentine puzzle book inspired by old Hollywood romance, silver screen sparkle, backstage secrets, love letters, champagne, and one perfectly timed kiss beneath the marquee lights.