Black Christmas (1974)
"It's time for Christmas break, and the sorority sisters make plans for the holiday, but the strange anonymous phone calls are beginning to put them on edge. When Clare disappears, they contact the police, who don't express much concern. Meanwhile Jess is planning to get an abortion, but boyfriend Peter is very much against it. The police finally begin to get concerned when a 13-year-old girl is found dead in the park. They set up a wiretap to the sorority house, but will they be in time to prevent a sorority girl attrition problem?"
Note: From director Bob Clark (R.I.P), visionary behind such genre hits as 'Children Shouldn't Play w/ Dead Things', 'Deathdream', Porky's & the seasonal classic 'A Christmas Story'.