I really would recommend this book if you like mysteries. This book is about a brother and sister who
Billy and Sheena are back visiting their biologist unle Dr. Deep.
Billy and Sheena went with their uncle to go search for a sunken pirate ship called the scarlet skull.
The three dive down in a small submarine to investigate.As they approach, the submarine engine dies and a black wave engulfs them. GULP.And yet, Billy and Sheena's day takes an even worse turn when Dr. D vanishes! Now they are all alone in the bottom of the ocean in a submarine with engine problems.
After making it back to the surface ,Billy manages to get the motor going, and they blast right into the sunken pirate ship.Billy and Sheena leave the submarine and swim to a nearby island.Billy's leg is injured in leaving the sub, forcing him to use a piece of driftwood as a crutch.
However, they soon find the zombie pirates and fall into a pit. They manage to escape with help from the driftwood, but are captured by the pirates and taken before their captain, Long Ben One-Leg, who has captured Dr. D and demands they return what is his.Thinking he means the treasure. Billy and Sheena went to look for it .
Billy and Sheena try to return the treasure, only to find that Captain Ben is not after the treasure; he wants his leg, the "driftwood" Billy has been carrying around. Billy returns it, by throwing it like a spear at him, knocking the captain overboard. The Scarlet Skull falls apart without its captain. After Dr. D climbs aboard, the trio pass through the black cloud again; which Dr. D explains had transported them into a Dead Zone