He is the police officer that comes help Nora in Hush, Hush. In Finale, it is discovered that Basso was in fact an archangel sent to earth to eliminate devil craft.
Biography
Hush, Hush
When Nora finds her room, she calld the police. Detective Basso arrives.
Nora gets into trouble, she calls Basso. He is weary of her, not believing everything she says
Silence
When Nora wakes up in the cemetery, Basso is the first to find her.