The 39 Clues Website is where users can sign up collect cards and clues, play missions, read articles about the characters, play games, and learn top-secret information. An alternate URL to the site is:, which is only located in the inside flap pages of The Maze of Bones. This is a connection to the mission which comes with the book, Mission 1: The Lost Clue, in which you investigate the Loch Ness monster, known as  Nessie, for a Clue.

New lookEdit

If you merge your scholastic plus account with your Cahill account, then this is how the website is going to look.


Joining the 39 Clues WebsiteEdit

To create a user on the site, you must first come up with a username and password. Secondly, you take a short quiz about which branch you will be placed in. (You are not able to be a Madrigal.)

The Clue Hunt, Cahills vs. Vespers, Unstoppable, and DoublecrossEdit

There are four sections on the 39 Clues website. The Clue Hunt and Cahills vs. Vespers. The Clues Hunt is for the first series, Cahills vs. Vespers for the second, Unstoppable for the third, and Doublecross for fourth.

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There is now a Map tab in the 39 Clues Website. This tab shows a map of the world dotted with keys. Each key represents a clue, and if you roll your mouse over a key, it shows the location. Orange keys mean you have unlocked this clue, and silver keys mean it is still locked. If you click "Locations" at the bottom of the screen, you will see a complete list of all the clue locations, sorted by how you can unlock them, and colored so you can see if it is still locked or not. Also, there used to be a small cell phone in the upper left-hand corner that let you know if you have any messages in your inbox, but now it has disappeared. Note: There are 40 keys on the map, representing the 39 Clues and Mission 10, as you don't get a Clue in that Mission.

My CluesEdit

Please see the main article: My Clues

My Clues is where users can see all the clues they have collected in a giant chart. This chart changes with each book release. The clues can be sorted by branch. Each clue, when clicked, comes to a red screen. A brief summary and a video is given. If you have not collected a clue yet, you will see a locked box that will tell you how to get this clue.


Arena 39Edit

Please see the main article: Arena 39

Arena 39 is where users can play 13 different games and compete in contests with real-life prizes. There is one contest per book release. Whichever player has the best episode points, (the high scores of all their games added together) wins a special trip or some other prize. When all the books are released, whoever has the most points (points gained by playing games) at the end receives a grand prize, with minor prizes as well..

Books (The First Series)Edit

Here at the Books tab, you can choose from the list the book you would like to see. You can see a brief summary, an a excerpt, and a small paragraph about the author. You can also see pictures of locations and characters that appeared in the book. There are also book puzzles you can solve to unlock a Card replicator. This can be from codes found throughout the book or by adding cards.

The First SeriesEdit

Please see the main article: Books

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The Second SeriesEdit

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Series 3: UnstoppableEdit

Unstoppable Books

The 3rd Series consists of 4 books written by Jude WatsonJeff Hirsch Natalie Standiford and Gordan Korman.

Series 4: Doublecross Edit

Doublecross is the fourth 39 Clues series. Jude Watson, C. Alexander London, Jenny Goebel and Sarwat Chadda will write these books. In February 2015, with the release of Mission Titanic, a new website was also launched for Doublecross and the Message Board. It works alongside the old website.

Series 5: SuperSpecial Edit

The fifth seties of 39 Clues, Superspecial, will begin on 27th September 2016.


The Clue HuntEdit

Missions are short tutorials where users can find a clue, learn more about the characters, and play quick games. They're almost always in some foreign country where the player must find a clue hidden by a branch.

ALL 11 have been released, one for each book.

Cahills vs. Vespers MissionsEdit

In each of the missions, users uncover one of the Vesper Council members. In the missions, agents play quick games, such as Code Breaking, or Skydiving. All of the missions have been released.

There is also a new mini-game called Vesper Hunt which allows you to play mini-games and hunt down Vesper. (Also available as an app for iOS and Android)

 Unstoppable MissionsEdit

There are four Unstoppable missions corresponding to the Unstoppable books. In each one you find an ingredient of the antidote to the serum.

Doublecross Missions Edit

There are four Missions in Doublecross. In a departure from the past, these missions do not involve either Unity or Flash, and are quite mobile-friendly.

Cahill WebEdit

Please see the main article: Cahill Web

Cahill Web is like a giant internet encyclopedia about everything 39 Clues. There are articles and information from fake sites like and CliqueMe. is simply information on Cahills, Clues, and other information. CliqueMe is a social networking site where most of the characters have profiles. The information and documents are sorted by which branch they belong to, and only members of that branch can access and see the information stored in those archives. For example, a Tomas agent cannot access an Ekaterina Archive. Some Archives are available to all agents, and are marked with the Cahill/Madrigal "C".

Other FeaturesEdit

Also on Cahill Web are polls and an inbox, which contains messages that each branch sends to its players.

Also, each branch has a secret archive that is only accessible by players that belong to that branch. For example, a Ekaterina trying to access Lucian files would be shown a screen that reads "Intruder Alert! Lucians Only! All others will be thrown in the snake pit." Each branch has a different security page, but Ekaterinas are only allowed to see the Ekaterina archives and Lucians are only allowed to see Lucian archives, and for the Janus is for the Janus Members only and in the Tomas branch only Tomas users can see it. All branches can view archives under the "Cahill" logo.

The Message Board is where you and other Cahill agents can talk about the books, as well as other things. Everything is moderated, so you can't say anything personal (i.e. birthdays, towns, last names, etc.).


This section is where when you press on "Message Board" or "My Cards" It will have boxes leading to both The Clue Hunt and Cahills vs. Vespers.


My CardsEdit

My Cards is where users can see all the cards they have collected. Cards can be sorted by branch, type, rarity, combo, most recent (added cards), allied agent (Agent Cards), and then new sort, which clears all selections.

Cards are displayed in a chart of 21 cards. Each card when clicked on may have a Top Secret tab in which secret information may be given. Cards can be combined to make clues.

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Agent CardsEdit

Agent Cards are cards that users can make and share with other users through a code. These cards can be decorated with stickers, and all the authors of the books have one.

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The 39 Clues
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