Motor Matt in Brazil; or Under The Amazon by Stanley R. Matthews follows the crew of the _Grampus_ as they embark on a perilous journey to the Amazon. Ensign Glennie's mission to recover stolen dispatches becomes entangled with mysterious incidents and internal conflicts within the crew. As they navigate the treacherous waters facing unexpected obstacles and external threats the crew must rely on courage and resourcefulness to overcome the challenges ahead. This thrilling adventure story is part of the Motor Stories series known for its fast-paced plots and engaging characters.