Following the events where Angel's soul was removed to gain information from Angelus, the team discovers the soul has been stolen from its "safe" containment. The episode focuses on:
: Angelus spends the episode "Hannibal Lecter-ing" the group, using his intimate knowledge of their insecurities to tear them apart from within their own base.
The ending of "Calvary" is famous for one of the biggest reveals in the Buffyverse : . She stabs Lilah in the neck, revealing that she is the one who let Angelus out and is actually the "Master" behind the Beast. Critical Analysis & Themes Angel 4×12: Calvary - Critically Touched - WordPress.com