- Buku AudioPrince of SpiesAlex Gerlis
- Buku AudioRing of SpiesAlex Gerlis
- Buku AudioSea of SpiesAlex Gerlis
- Buku AudioEnd of SpiesAlex Gerlis
- Buku AudioThe Swiss SpyAlex Gerlis
- Buku AudioThe Miracle of NormandyAlex Gerlis
- Buku AudioAgent in the ShadowsAlex Gerlis
- Buku AudioThe Best of Our SpiesAlex Gerlis
- Buku AudioAgent in PerilAlex Gerlis
- Buku AudioVienna SpiesAlex Gerlis
- Buku AudioThe Berlin SpiesAlex Gerlis
- Buku AudioSeri: Richard PrinceAlex Gerlis
- Buku AudioAgent in PerilAlex Gerlis
- Buku AudioSeri: Spy MastersAlex Gerlis
- Buku AudioSeri: The Wolf PackAlex Gerlis