Gray Team series

The Gray Team series is the retroactive name given to Halo novels focusing on Spartan-II Gray Team, written by Tobias Buckell. It consists of Halo: The Cole Protocol (2008), and Halo: Envoy (2017).

Novels

Title	Cover	Author	Audio book narrators	Publication	Summary
Halo: The Cole Protocol		Tobias Buckell	Jonathan Davis	2008	Introduces Gray Team and details the backstories of Jacob Keyes and Thel 'Vadam.
Halo: Envoy		Tobias Buckell	Scott Brick	2017	Follows Melody Azikiwe on a diplomatic mission on Carrow, while searching for a way to rescue Gray Team from captivity and their role in the Carrow Conflict.

Continuity

This series shares narrative connections with the short story Oasis from Halo: Fractures, with Halo: Envoy essentially acting as its sequel.