Brant Twins Mysteries Jimmy and Sally Brant are 13-year-old twins that are about as different as you can get. Sally, technically the older of the two (she was born three minutes before her brother), looks much younger. She is petite, blonde with a hint of red that glints in the sunlight and has fair skin that freckles with exposure to the sun. Jimmy, not at all happy about being "younger" than his twin sister, is tall and dark with brown eyes and a smooth even tan. His brown hair has sun-bleached streaks, the result of spending a lot of his time outdoors. As they follow their parents around the world (their mother is a marine biologist and their father is an ecological specialist), they always manage to find themselves in the middle of a mystery, without even trying. Although Jimmy and Sally have the normal brother-sister squabbles, when danger threatens (which it often does), they always have each others backs. The Sinister Submarine It was just supposed to be a day at the beach, with some swimming and snorkeling, in the clear blue waters surrounding a small Bahamian island. But then everything changed. Sally was the first to see it - a dark shadow on the ocean floor. Carefully Sally, Jimmy and their new friend Sandy, swam towards the shape in order to get a better look and were startled by what they saw. What the heck is an old, World War II submarine doing in the waters of the Bahamas? That's just one of the questions that 13-year-old twins, Jimmy and Sally Brant need to answer as they find themselves in the middle of a mystery. Follow along as they discover clues, dodge danger and even rescue a dolphin as they use all their skills, and some help from the U.S. Coast Guard, to solve the mystery of the Sinister Submarine.