The young British archaeologist Tim Frazer is visited by an old friend: Henry Denston. At an agreed appointment, however, the man does not show up, giving rise to a mysterious investigation.
| Actor | Role |
|---|---|
 Giancarlo ZanettiTim Frazer | Tim Frazer |
 Renato MontalbanoDottor Bossi | Dottor Bossi |
 Lorenza GuerrieriHelen Barker | Helen Barker |
 Margherita SestitoMargherita Mengozzi | Margherita Mengozzi |
 Norma JordanDebra Markos | Debra Markos |
 José QuaglioMr. Ross | Mr. Ross |
 Romano MalaspinaLeo | Leo |
 Renato De CarmineEric Edwards | Eric Edwards |
 Marcello MandòIspettore Ancona | Ispettore Ancona |
 Franco AngrisanoTraetta | Traetta |
| LLicia LombardiRuth Edwards | Ruth Edwards |