They walked like men
Money was worthless; it had no value! It couldn't buy housing, clothing, or food. Someone with enormous quantities of cash was buying houses and tearing them down, buying stores and closing them.

Perhaps a few people could have stopped the transactions before it was too late. They could have said that Earth was being taken over by alien beings in the shapes of bowling balls, talking dogs, and dolls that walked like men. 

In fact, they did say it. The trouble was, no one believed them!
Fiction in English, Fiction, Science Fiction, Human-alien encounters in fiction, Human-alien encounters
Clifford D. Simak
Clifford Donald Simak (August 3, 1904 – April 25, 1988) was an American science fiction writer. He won three Hugo Awards and one Nebula Award.The Science Fiction Writers of America made him its third SFWA Grand Master,[4] and the Horror Writers Association made him one of three inaugural winners of the Bram Stoker Award for Lifetime Achievement.[5] He is associated with the pastoral science fiction subgenre.