The Whistler (S)

Lindsey, is put in charge of babysitting her younger sister, Becky, one night while her parents go out to dinner. Lindsey spends the evening texting her boyfriend while a horror film plays on the TV. Her boyfriend, Mike wants to come over to have sex with Lindsey, but Lindsey is afraid that Becky will tattle tale on her, so she tells Mike not to come. Becky interrupts Lindsey telling her that she’s lost her pet rat Freddy.