A poor art student in New York City discovers a duffel bag full of diamonds in the chaos during an attack at Grand Central Station and is pursued by the Ghost, an assassin who had murdered the bag's owner.

Billy and his sister, Sheena, unwittingly dive into a terrifying mystery when they accept a surprise invitation to HorrorLand--the amusement park that always lives up to its name. But first Billy and Sheena must sink or swim aboard a doomed ship that happens to be underwater--with a captain who happens to be dead. At least, he used to be!

Charlie Gordon knows that he isn't very bright. At 32, he mops floors in a bakery and earns just enough to get by. Three evenings a week, he studies at a center for retarded adults. But all of this is about to change for Charlie. As part of a daring experiment, doctors are going to perform surgery on Charlie's brain. They hope the operation and special medication will increase his intelligence, just as it has for the laboratory mouse, Algernon. Meanwhile,...