Casebusters (1986)

A brother and sister (Noah Hathaway, Virginia Keehne) are amateur sleuths who help their grandfather (Pat Hingle) run a security business. While digging around on their own, they accidentally stumble onto a major case.

Director: Wes Craven

Cast: Pat Hingle, Noah Hathaway, Virginya Keehne, Gary Riley, Sharon Barr, Thomas F. Duffy, Arthur Taxier, Nicholas Worth, Boyd Bodwell, Carlos Lacamara, Sid Conrad, Eugene Collier, Thomas Lew Mann, Tim Russ, Ebbe Roe Smith