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Solve the Case!
With Holly Holmes and Dogson

Become a LEGO Junior Detective and solve 17 mysteries with this fun activity book and buildable minifigure!

LEGO Junior Detective Agency set 9781837250134 - 23 pieces, Activity Books with LEGO Parts theme, product photo Pin It
⚠ RETIRING SOON
LEGO Junior Detective Agency set 9781837250134
🏛 Activity Books with LEGO Parts
Set #9781837250134

Junior Detective Agency

The Junior Detective Agency set is a charming little mystery in a box.

Before you buy

Who it's for
Beginner build Perfect for young children and those new to LEGO building who enjoy interactive play.
Build
23 pieces · about 0.5 hours Build time is an estimate.
Availability
Likely retiring soon
★★★☆☆ 3.8 AI-generated review score, not a customer rating

A fun, accessible set that combines LEGO building with an engaging mystery. While the build is simple, fans appreciate the unique play experience and the inclusion of a detective minifigure, but some may find the piece count low for the price.

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📝 Our Take

AI-assisted editorial summary, grounded in our LEGO database and public community discussions. How we use AI

The Junior Detective Agency set is a charming little mystery in a box. It's a fun, interactive set that combines the joy of LEGO building with the thrill of solving a mini-mystery, making it a unique offering in the activity book category.

This set is perfect for young LEGO enthusiasts and budding detectives. The build is simple and quick, making it accessible for beginners, while the included story and clues provide an engaging play experience beyond the construction phase.

Skip this if you're an experienced builder looking for a complex model. This set is designed for younger audiences and those who appreciate the combination of LEGO and storytelling, consider larger sets for more challenging builds.

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How does this set combine LEGO building with storytelling? What are some creative ways to use the magnifying glass and other detective tools? How does this set compare to other LEGO activity books in terms of value? Is this set suitable for displaying or is it primarily for interactive play?

🧱 Building Experience

AI-assisted build estimate, grounded in our LEGO database and public community discussions. How we use AI
🧩
23
Pieces
⏱
0.5h
Estimated Build Time
📊
Beginner
Difficulty
Build Highlights:
  • Simple and quick build, ideal for beginners
  • Incorporates storytelling and problem-solving elements
  • Small, portable design for on-the-go fun
  • Uses basic building techniques to create a detective's toolkit

📈 Investment Analysis

AI-assisted investment analysis, grounded in our LEGO database and public community discussions. How we use AI
Not enough price history for a trend
C
Investment Grade
⏳ Likely retiring soon
This set is unlikely to be a significant investment. Its low piece count and availability as part of an activity book mean it's unlikely to command high prices on the secondary market. While the unique combination of LEGO and storytelling might appeal to collectors, the limited edition nature of the set may create some long-term demand, but only for sealed or mint-condition copies.

Not Financial Advice: Content is for educational purposes only. Past performance doesn't guarantee future results. Full disclaimer

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This set offers a unique blend of LEGO building and storytelling, setting it apart from traditional LEGO sets. While it doesn't compete directly with larger, more complex sets, it provides a fun and engaging experience for younger builders interested in mystery and problem-solving. Consider other LEGO activity books for similar experiences.

1 Minifigure Included

Black Torso, Dark Red Legs, Dark Red Beanie
Black Torso, Dark Red Legs, Dark Red Beanie
4 parts
C+
The set includes a single minifigure with a dark red beanie, black torso, and dark red legs. It's a fairly standard figure, ideal for playing the role of the junior detective.
Browse All Minifigures → | Best Investment Minifigs

📦 Parts Inventory

Piece count
23
Parts cataloged in this inventory
16 unique parts, 19 pieces
Minifigures
1

The piece count includes the 4 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Missing a piece? Check this set piece by piece, with look-alike colors flagged and element IDs for replacements.

Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Plate Special 1 x...
Part #: 15573 1× Reddish Brown
Plate Special 1 x 2 with Handles on Ends Plate Special 1 x...
Part #: 18649 1× Black
Tile Round 1 x 1 Half Circle Tile Round 1 x 1 ...
Part #: 24246 1× Black
Brick 2 x 2 Brick 2 x 2
Part #: 3003 1× Reddish Brown
Brick 1 x 2 Brick 1 x 2
Part #: 3004 1× Reddish Brown
Tile 1 x 2 with Smart Phone, Icons Print Tile 1 x 2 with S...
Part #: 3069bpr0189 1× Black
Brick Special 1 x 2 with Vertical Closed Handle on Edge Brick Special 1 x...
Part #: 34816 1× Reddish Brown
Plate Special 1 x 2 Rounded with 2 Open Studs Plate Special 1 x...
Part #: 35480 1× Black
Plate 2 x 6 Plate 2 x 6
Part #: 3795 1× Reddish Brown
Equipment Magnifying Glass with Thick Frame, Hollow Handle, Trans-Clear Lens Pattern Equipment Magnify...
Part #: 38648pat0001 1× Black
Bracket 1 x 2 - 2 x 2 Bracket 1 x 2 - 2...
Part #: 44728 1× Tan
Brick Curved 1 x 2 x 1 1/3 with Curved Top Brick Curved 1 x ...
Part #: 6091 2× Reddish Brown
Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Plate Special 1 x...
Part #: 61252 2× Black
Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm] Plate Special 1 x...
Part #: 88072 1× Black
Arm Skeleton [Bent / 2 Clips] Arm Skeleton [Ben...
Part #: 93609 1× Black
Tile Round 1 x 1 with Offset Black Eye Print Tile Round 1 x 1 ...
Part #: 98138pr0008 2× White
The parts selection is limited but includes a few useful elements like the printed smartphone tile and magnifying glass. The reddish-brown curved bricks could be helpful for small-scale architectural details.

🛒 Where to Buy

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💎 Notable Parts

Black Tile 1 x 2 with Smart Phone, Icons print (1x) $0.75
Black Equipment Magnifying Glass with Thick Frame, Hollow Handle, Trans-Clear Lens (1x) $1.50
White Tile Round 1 x 1 with Offset Black Eye Print (2x) $0.50
Est. BrickLink Part Value
$2.75

💡 MOC Potential

🏙 Small detective office interior build
🚗 Miniature getaway car for a chase scene
🌳 Hidden clues in a park or garden setting

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Community insights from Reddit discussions and YouTube reviews. Content may not reflect official LEGO positions.

Charts Inventory Statistics

16
Unique Parts
23
Piece Count
19
Cataloged Inventory Pieces
1
Minifigures

The piece count includes the 4 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

Inventory Version: 1

Missing a piece? Use the Missing Piece Checker.

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