The Aftermath (Book 2: Chase‪)‬

One is gone. Another is horribly injured. This is the scene that Mike returns to the morning after his midnight joyride. While he struggles to redress this latest tragedy, the newcomer Vlogman reveals a startling revelation about the infected:

Their purpose is to kill silently at night, when their victims are most vulnerable.

Bad news for Mike, as one particular infected has set its sights on him.