Duty Waits (The Horus Heresy Series)

On Terra, the Imperial Palace awaits war. Since the Alpha Legion infiltrated the mighty structure, the Imperial Fists have upped their patrols, defences have been tightened and the planet prepares for the coming of Horus. Four primarchs stand ready to defend the Throneworld. But the enemy do not come. As the situation worsens and morale drops, Captain Maximus Thane and his company are forced to deal with a civilian riot – with tragic consequences.

Read it Because
It's a story that only Guy Haley could write, getting in the heads of Space Marines on Terra's walls, and showing the devastating effects of waiting for an uncertain assault.