LUCIAN
People: Leaders and Spies
Members: Ian and Natalie Kabra
Irina Spasky
Natasha R.R.
Leaders: Vikram and Isabel Kabra (Ian and Natalie's parents)
Headquarters: Paris, France - Enter a code on the fence.
Russia - Go into a theater or something like that and take an elevator with a huge picture of the whole Kabra family down.
JANUS
(The regular picture is unappropriate.)
People: Artist and Musicians
Members: Jonah Wizard (and his dad)
Leader: Cora Wizard (Jonah's mom), as well as two other people named Halima Amadi and Spencer Langendeon
Headquarters: Venice, Italy - Go into Disco Volante, go to listening station, press K617 (or something like that) and an elevator lowers you.
EKATERINA
People: Inventors, Scientist
Member: Alistair Oh
The Starling Triplets (Ned, Ted, and Sinaed)
Leader: Bae Oh (Alistair Oh's uncle)
Headquarters: Cairo, Egypt - Go into a hotel in Egypt and open a umbrella. You get the key inside and open the door that's next to your hotel room.
TOMAS
People: Explorers, Discoverers, and Athletes
Members: The Holts (Eisenhower, Mary-Todd, Hamilton, Madison, Reagan, and their put-bull Arnold)
Leader: Ivan Kliester
Headquarters: Unknown (not in book)
MADRIGALS
Not much is known about this branch, except that the Man in Black is a confirmed Madrigal. William McIntyre MAY be a Madrigal, same with Nellie and N.R.R. There are some suspicions that Amy, Dan, Grace, Hope, and Arthur are/were Madrigals as well. We just know that they are supposed to make the clue hunt harder, but the Man in Black saved Amy and Dan in the end of book 5. The Cahill symbol is black and the key has a letter "M" on the end. Some think that it means that the last clue will be hard to find because the Madrigals have it.