Cries in the dark (2006)

Detective Carrie Macklin and her little sister Elle had always been the closest of friends. But when Elle goes missing after a run-in with a relocated sex offender, it is up to Carrie to find her little sister...who is nine months pregnant. Carrie begins to suspect Elle's husband, Scott, may be involved. Family tensions run high as it's a race against time to find Elle and her baby