On a remote island near the site of a deadly trans-dimensional incursion, the ProteC Corporation and their Equestrian allies are manning a facility with a unique mission: contain and study things which should not exist.
This is a sexier spin-off series of Equestrian Alliance: Project Oblivion.
If you have not done so already, it is strongly recommended that you read the novel "Equestrian Alliance: Project Oblivion" before starting Menagerie, as the events relayed in the novel take place before Menagerie begins.