An elderly heiress is killed by her husband who wants control of her fortunes. What ensues is an all-out murder spree as relatives and friends attempt to reduce the inheritance playing field, complicated by some teenagers who decide to camp out in a dilapidated building on the estate.
| Actor | Role |
|---|---|
 Claudine AugerRenata Donati | Renata Donati |
 Luigi PistilliAlberto / Albert | Alberto / Albert |
 Claudio CamasoSimone / Simon | Simone / Simon |
 Anna Maria RosatiLaura | Laura |
 Chris AvramFranco Ventura / Frank Ventura | Franco Ventura / Frank Ventura |
 Leopoldo TriestePaolo Fosatti / Paul Fosatti | Paolo Fosatti / Paul Fosatti |
 Laura BettiAnna Fossati | Anna Fossati |
 Brigitte SkayLouise / Brunhilde | Louise / Brunhilde |
 Isa MirandaCountess Federica Donati | Countess Federica Donati |
 Paola MonteneroSylvie / Denise | Sylvie / Denise |
 Nicoletta ElmiRenata and Albert's Daughter (uncredited) | Renata and Albert's Daughter (uncredited) |
 Renato CestièRenata and Albert's Son (uncredited) | Renata and Albert's Son (uncredited) |
 Roberto BonanniRoberto / Bobby | Roberto / Bobby |
| GGiovanni NuvolettiCount Filippo Donati | Count Filippo Donati |
 Guido De CarliLuca / Duke | Luca / Duke |