Polstergeist(1986)

Aunt Lilli and niece Nina are locked in a furniture store. They want to go on vacation and have to catch the plane. How can they get out in time? The night watchman, who finally finds them, wants to let them out but has to get the key first. He doesn't come back. Nina follows him and meets a strange colleague of the night watchman. It turns out that he is a burglar and has murdered the night watchman. Nina is in great danger and Aunt Lilli helps her to escape. After a fast-paced chase, the burglar stabs himself. Where to put the two bodies?