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Detective Comics #229 cover
Cover: Win Mortimer

Detective Comics #229

Mar 1956 · DC · 0.10 USD
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In "The 10,000 Secrets of Batman!", Batman’s confidence wavers when he realizes his Bat-Cave’s microfilm archives—containing countless criminal secrets—have vanished just as a live TV broadcast is set to air. Dick Sprang’s dynamic art and Charles Paris’s inks bring the tension to life as the Caped Crusader races to uncover the breach, while Win Mortimer’s cover captures the eerie spectacle of the moment.

Contains 4 stories
The 10,000 Secrets of Batman!
12 pp · Superhero
Batman [Bruce Wayne]Robin [Dick Grayson]Commissioner James Gordon (cameo)John Creeden (villain)Mart Mathers (villain)

In "The 10,000 Secrets of Batman!" from Detective Comics #229 (1956), Batman's carefully guarded secrets are put at risk when a planned TV broadcast from the Bat-Cave leads to the shocking discovery that his microfilm files have vanished—leaving the Dark Knight scrambling to prevent a catastrophe before the criminal underworld gains access to his most closely held knowledge.

The Diamond Mine on Broadway
6 pp · Detective-Mystery
Roy RaymondKarenJoshua Maddern (villain)
Untitled Humor story
0.67 pp · Humor
Casey the CopLefty
The Phantom Bodyguard
6 pp · Superhero
Martian Manhunter [J'onn J'onzzaka John Jones]Captain HardingLaurence Cowan (introduction)Drexel Mansfield (villain, introduction)

In "The Phantom Bodyguard," Drexel Mansfield’s fear of assassination takes a chilling turn when Detective John Jones uncovers a web of deception—what seemed like a deadly conspiracy may actually be a desperate attempt to ruin a business partner. Written by an unknown author and illustrated by an unknown artist, this 1956 tale from Detective Comics #229 blends suspense and betrayal in a tight, taut six-page mystery.

ComicBooks.com Value

Our Model is In Beta
Raw (VG) $117
CGC 9.0 · 2 in census $1,780
CGC 8.5 · 4 in census $856
CGC 8.0 · 4 in census $700
CGC 7.5 · 4 in census $542
CGC 7.0 · 4 in census $414
CGC 6.5 · 3 in census $369
Show all 17 grades
CGC 6.0 · 3 in census $348*
CGC 5.5 · 7 in census $272
CGC 5.0 · 4 in census $272*
CGC 4.5 · 4 in census $254
CGC 4.0 · 3 in census $215*
CGC 3.5 · 1 in census $177*
CGC 3.0 · 1 in census $138*
CGC 2.5 none in existence
CGC 2.0 · 3 in census $95
CGC 1.5 none in existence
CGC 1.0 · 2 in census $62*
* estimate — limited direct-sales data at this grade
Our model’s value — refined as new sales data arrives · CGC census counts shown where available

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Full credits

cover pencils, inks Win Mortimer

Reprints

Reprinted in Batman #76 (1956), Batman Annual #1 (1961), Baticomic #8 (1968), Giant Batman Annual #1 Replica Edition #[nn] (1999), Showcase Presents: Martian Manhunter #1 (2007), DC Comics Classics Library: The Batman Annuals #1 (2009), Batman #38

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