Angel and his teenage son Connor have not exactly got off to the best of starts. They have fences to mend between them and a mysterious otherwordly monolith brings their conflict to a head.

Like any parent, Angel wants to understand his son. But it's hard when their different lifestyles keep getting in the way. Angel is overworked, Connor's embarrassed by Angel's taste for blood, and to make things worse Hyconian demons are running wild through the streets of L.A. There's not a lot of time for bonding and there's even less when a gigantic monolith appears out of thin air, right in the middle of Hollywood Boulevard.

Nobody knows what to make of the massive rock with two demon faces etched into its surface. News stations think it is all an elaborate stunt to publicise a movie. Religious extremists hail it as a sign of impending doom. But one thing is certain: as Angel Investigations struggles to make sense of the menacing rock and its meaning, Angel and Connor will have to work together to survive.