Diabolicamente... Letizia (1975)

Marcello and Micaela want to have a child, but it seems Micaela has medical issues preventing a pregnancy. Marcello wants to go to Switzerland for more exotic treatments, but Micaela chooses instead to have her niece Letizia brought home from a fancy boarding school to live with them instead . Unfortunately for Marcello and Micaela, there is something wrong with Letizia, whose presence in their home kicks off a sinister series of disturbing events.