Every manned mission to the planet Neptune has ended in tragedy and the latest mission by the Martian Republic has not fared well. The Martian Space Agency's base ship, Poseidon, has lost two of only three explorer vessels and the last has been tasked with finding them. Among the crew of the explorer craft is Marcus Black, son of Jonas Black, an engineer and the ship's co-pilot. The crew of the explorer vessel embark on a daring voyage that take them into the heart of the unknown. To those in command of the mission, the last crew, like the others before them, appear to have vanished. However, an urgent message from a surviving crew member inspires a desperate rescue attempt. Delivered by an experimental naval vessel, Jonas Black commands the team that he hopes will be able to rescue his son from Neptune's trojan asteroid field. As the Earth Federation Navy tighten's its grip on the sector, hoping to gain new weapons technology, tensions rise and a Martian Navy captain is faced with a difficult situation. Will Jonas and his allies be able to discover the secret of Neptune's Trojan or will they be destroyed by it? Join the Jonas and Katherine Black on their next adventure; this time with their Marcus, William and Matthew. Trojan is the second book in The Black Chronicles series.