Katharine Milford commits suicide by jumping out the window. Her brother, Richard refuses to believe the police story about suicide, and when it is discovered that more people had contact with Katharine died in the same way he starts a private investigation, which leads the man into Londons 'dirtiest hippie clubs. It seems that music is the common factor in all suicide - or was it murder?
| Actor | Role |
|---|---|
 Romina PowerFanny | Fanny |
 Brett HalseyRichard | Richard |
 Marilù ToloHelen | Helen |
 Fabrizio MoroniHarry | Harry |
 Alberto DalbésAlbert Stone | Albert Stone |
| ÓÓscar PellicerNot listed | Not listed |
 Gérard TichyInspector | Inspector |
| MMiguel de la RivaLoco | Loco |
| JJames FontaineNot listed | Not listed |
 Manuel de BlasBoris Molders | Boris Molders |
 Dan van HusenBeatnik | Beatnik |
 Lili MurátiProfessor Stone's Widow | Professor Stone's Widow |