Sherlock, a young and precocious tabby cat, lives a privileged and comfortable lifestyle indoors with his unique sister, Elf. He should be content, but instead, day by day, he is becoming more and more curious about life on the other side of the windows. He is consumed with a feeling of restlessness that he cannot understand. Owner has gone on a three day vacation and Sherlock is in charge of the house. Full of adolescent bravado, it doesn't take him long to get into trouble.......trouble that nearly ends one of his lives. It is only due to Elf's chance discovery that he is saved. And it is through that discovery that Sherlock tricks Elf into opening the door to the outside. Outside where, from the kitchen window, he'd seen mysterious dark shadows stir and then disappear into the thicket behind the old shed. Unbeknownst to the two naive insiders, evil is making its way into the neighborhood with Elf as its target.