ɪn ɐdˈɪʃən tə ðə sˈiːkɹᵻt hˈɪstɚɹi fˈɪlmz, ɡˈæʔn̩ ɪz wˈɜːkɪŋ ˌɔn tˈuː ɐdˈɪʃənəl fˈɪlm sˈɪɹiz, wˈʌn ˌʌndɚ ðɪ ʌmbɹˈɛlə tˈaɪɾəl fˈɪlmz fɔːɹ ɪnvˈɪzᵻbəl ˈɪŋk, ænd ɪŋklˈuːdɪŋ ðə fˈɪlmz kˈeɪs nˈoʊ. sˈɛvənti wˈʌn: bˈeɪsplˈʌsfˈɑːɡ ænd kˈeɪs nˈoʊ. wˈʌnhˈʌndɹɪd fˈoːɹɾi tˈuː: ɐbɹˌiːvɪˈeɪʃən fɔːɹ dˈɛd wˈɪntɚ dᵻmˈɪnɪʃt baɪ wˈʌn,sˈɛvənhˈʌndɹɪd nˈaɪnti fˈoːɹ, æz wˈɛl æz "ðə wˈɛdɪŋ vˈaʊz fˈɪlm" kˈeɪs nˈoʊ. θɹˈiːhˈʌndɹɪd twˈɛnti θɹˈiː: wˈʌns əpˌɑːn ɐ tˈaɪm ɪnðə wˈɛst.
In addition to the Secret History films, Gatten is working on two additional film series, one under the umbrella title Films for Invisible Ink, and including the films Case No. 71: Base-Plus-Fog and Case No. 142: Abbreviation for Dead Winter [diminished by 1,794], as well as "the wedding vows film" Case No. 323: Once upon a Time in the West.