Return to Howliday Inn is fifth book of Bunnicula Series.
The Monroe family again leaves Harold, Chester, and Howie at Chateau Bow-Wow. The pets quickly notice differences, including a new group of animals staying there (a weasel, two cats named Felony and Miss Demeanor, a sad Great Dane named Hamlet, a pair of homesick dogs, and a parrot named Ditto). Howie is thrilled to be at his birthplace; Chester is none too pleased. Soon however, all of the animals are in for a shock—They hear a female dog named Rosebud calling from the other side of the fence. When they dig at the dirt around the fence, they find a few bones and a dog collar. Rosebud tells them that she discovered a horrid secret about Chataeu Bow-Wow which sealed her fate and warns the animals to escape. Undaunted, Chester begins to investigate.
After listening in on Ditto, he hears her repeated "6, 1, 1, 1, 5". Later, she repeats what appears to be the entire sequence of numbers: "6, 1, 1, 1, 5, 2". Upon hearing this, Felony and Miss Demeanor are thrilled. When asked, they reluctantly reveal that they wanted to sneak into the kennel worker's building to steal better food and believed that the code would get them in. Shortly after, a tearful kennel worker takes Hamlet into the building. Georgette is brought to Chataeu Bow-Wow and tells the animals the true story of Rosebud: She was alive and well and back with her owners. The bones were chicken bones and her collar had been lost prior. The animals enter the building and find Hamlet, who tells them that his old owner left him there a long time ago. He was now set to be put to sleep. Chester finds his owner's new address and they set off to bring Hamlet there. The new address turns out to be a nursing home, one which does not allow animals. The pets break in and in the chaos, it becomes clear that the patients love the arrival of the animals, who remind them of their old pets. Hamlet finds his old owner, and it is revealed that the owner was a ventriloquist, explaining how Hamlet caused "Rosebud" to speak. Using ventriloquism of their own, the pets and patients convince the staff of the nursing home to allow Hamlet to stay. When Harold, Chester, and Howie are picked up at the end, they fool the Monroes with the ventriloquism tricks they picked up.