Complete story — includes the ending
During a power outage, Alexis and Hayley get an unexpected axe-wielding visitor who promptly dies from a previous wound. While the team investigates the murder, the victim's obsession with Biblical prophecy on the end of days---and a jarring discovery inside his own private investigations office---causes Castle to become increasingly obsessed with the idea he is marked for death and the end of days may be coming. Meanwhile, Beckett and Caleb meet again with Caleb making a striking admission to her.
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, Castle season 8. HTML formatting and reference markers removed. · Content license