Alpha Adventure
1 The Adventurers (2015)
2 A Is for Amethyst (2014)
3 B is for Bullion (2014)
4 C Is for Crystal (2016)
5 D Is for Diamond (2016)
6 E is for Emerald (2018)
The Ruby Riddle (2025)
2 A Is for Amethyst (2014)
3 B is for Bullion (2014)
4 C Is for Crystal (2016)
5 D Is for Diamond (2016)
6 E is for Emerald (2018)
The Ruby Riddle (2025)
Omnibus editions