A horrible demon enters our dimension through a portal in the Caritas.  The Host gets Angel Investigations in to help with the case.  Come to find out, the demon is from his dimension.  Investigating a vision of Cordelia's that seems to be related, Angel and the Host go to a library and inadvertantly open a portal that allows one of the Host's own family through.  After defeating the demon, the group opens the portal in the Caritas to send the Hosts cousin back and Cordelia is swept along with him.