Boo! Watch out for this rollicking, cumulative counting book for a Hallowe'en treat that's more playful than scary.Features an audio read-along! When a little ghost goes slip-sliding down the hallway, he suddenly hears ... a groan! Turns out it's only a friendly mummy, who shuffles along with the ghost, until they encounter ... a monster! As the cautious explorers continue, they find a surprise at every turn - and add another adorably ghoulish friend to their tally. But you'll never guess who is the scariest creature in the house!