Final answer:
The statement is True. In The Hounds of Tindalos, Frank Belknap Long tells the story of Halpin Chalmers, who seals all the openings in his home with plaster to prevent extradimensional creatures from entering.
Step-by-step explanation:
The statement is True. In The Hounds of Tindalos, a horror story written by Frank Belknap Long, the protagonist Halpin Chalmers tries to protect himself from extradimensional creatures by sealing all the openings in his home with plaster. These creatures, known as the Hounds of Tindalos, can slip through any opening, even in their gaseous form. By sealing the holes, Halpin Chalmers hopes to prevent their entry into his home.