It's called The Medusa Project:The Set-Up by Sophie McKenzie
Yes, it is called Double Cross and it's from Nico's point of view
The Medusa Project series has the following books (in this order):The Set-upThe HostageThe ThiefThe RescueHuntedDouble-CrossHit Squad
Yes there is. At the end of the book Double Cross it says "more in... Hit Squad" meaning there is going to be a sixth medusa project book. Thus book is going to be released around March 2012. However Sophie Mckenzie said that Hit Squad is going to be the final book and she is thinking of writing it from a varied perspective but is still unsure. I hope this was helpful to many people :)
Codename: Cobra
In book 11 of the Odyssey The Gorgon is mentioned, not the name of Medusa.
Yes, there are various books featuring or referencing the myth of Medusa. Some examples include "Medusa the Mean" by Joan Holub, "Monsters: Medusa" by Bernard Evslin, and "Medusa's Gaze and Vampire's Bite: The Science of Monsters" by Matt Kaplan.
There is not going to be a 12th 39 Clues book, but there is going to be a new 39 Clues series. The first book in the new series is called The Medusa Plot by Gordon Korman.
No. not yet but when/if they make one I so want to play Nico.
The Medusa Plot
From medusa
Montauk Project - book - was created in 1992.
Project Blue Book was created in 1952.