- AudiolivroThe Enigma SourceCharles Breakfield
- AudiolivroThe Enigma ThreatCharles Breakfield
- AudiolivroThe Enigma DragonCharles V Breakfield
- AudiolivroThe Enigma BeyondCharles Breakfield
- AudiolivroThe Enigma StolenCharles Breakfield
- AudiolivroThe Enigma Gamers – A CATS TaleCharles V Breakfield
- AudiolivroThe Enigma AlwaysCharles Breakfield
- AudiolivroThe Enigma BrokerRoxannie Burkey
- AudiolivroThe Enigma RisingCharles Breakfield