Buffy and Angel have to work together to solve disappearances of teenagers and calm down the gang warfare going on in LA, swiftly discovering that barriers between realities are breaking down as a result of scientists attempting to restore the Soviet Union.
An organised, united effort is being made to destroy a portal that will allow an ancient tribe to return to their original dimension. Angel and Spike reluctantly work together and deal with their shared evil pasts, Spike having fallen in love with a member of the tribe over a century ago.
Between Mexico and Arizona, Riley and Sam Finn call in Buffy and Angel to investigate mysterious supernatural occurrences, including a surge of vampire activity and the presence of a new kind of werewolf.
The books featured in this list are not part of Buffyverse canon. They are not considered as official Buffyverse reality, but are novels from the authors' imaginations. However unlike fanfic, 'overviews' summarising their story, written early in the writing process, were 'approved' by both Fox and Whedon (or his office), and were therefore later published as officially Buffy or Angel merchandise.