Creep from the Deep is a novella written by R. L. Stine. It was first published in 2008 and is the second book in the Goosebumps HorrorLand book series.
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Billy and Sheena always expect adventure when they join their uncle, Dr. Deep, aboard his hi-tech boat. What they don’t expect is a treasure hunt leading to a 200-year-old sea captain… who refuses to stay dead! Just when they think the tide is turning, Billy and Sheena accidentally drive into a dangerous mystery. A chilling surprise awaits them in Horrorland, the theme park where their worst nightmare is about to come to life.