Books like Monolith by J. G. Passarella

Even if it takes an eternity, he will make amends... father and son. Like any parent, Angel really wants to understand his son, Connor, but it's hard when life keeps getting in the way. Angel's overworked, Connor's embarrassed by his dad's taste for blood, and there are Hyconian demons running rampant through the streets of L.A. That doesn't leave a lot of time for bonding, especially when a gigantic monolith suddenly appears on Hollywood Boulevard. Nobody knows what to think of the massive rock with two demon faces carved into its exterior. The news stations think it's an elaborate publicity stunt for a recently released movie, and religious extremists call it a sign of impending apocalypse. As Angel Investigations struggles to understand what the rock's appearance means, it becomes clear that Connor and Angel will have to work together in order to survive.

First publish date: 2004