Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | Feral Skies | 2021 | Penn Cassidy | Buy |
| 2 | Dead Tides | 2022 | Penn Cassidy | Buy |
| 3 | Hell’s Apocalypse Duet | 2024 | Penn Cassidy | Buy |
Penn Cassidy’s Hell’s Apocalypse series has three entries published between 2021 and 2024. Feral Skies kicked things off in 2021, Dead Tides followed in 2022, and the Hell’s Apocalypse Duet rounded out the series in 2024. The two-year gap between the second and third books suggests Cassidy took extra time with the final installment.
The series is best read in publication order, as the story carries forward from one book to the next. All three titles are available through the Amazon links in the table above.