In early days of the war with the Free Cities, the Imperium dispatched a group of assassins known as the K'el Elandre. Their name was taken from an ancient text found in the Necroplois that translated roughly as the Keepers of the Dead, or more accurately as... caretakers.
Their mission was to eliminate generals in their tents, while their armies slept. They waged a bloody war from the shadows with silent bolts, poisons, and daggers.
When the war ended, these assassins never returned home. Instead, they now sell their services to the highest bidder, and are now known simply as The Keepers.
The group find themselves on a mission to find these assassins, in order to discover who hired the Keepers and their assassin, a man known only as Martin, to ambush the governor's convoy and kill its protectors.