Proving Grounds
Series
- Underworld - book 4
Genres: fantasy, paranormal, science-fiction, urban-fantasy
Recordings
Narrated by Graham Halstead
- Runtime: 8 h 51 min
- Publisher: Podium Audio
- Released: 2020
- ASIN (ca): B088SLZMK1
- ASIN (us): 1774243865
- 34 chapters