The Case of the Magnetic Rocket Fuel

Grace and Jack, still haunted by their previous time-travel adventure, become increasingly cautious as the future begins to influence the present. Their quest to learn more about a mysterious ink leads them to a secretive science lab in the past, with the hope of uncovering answers. Along the way, they confront the importance of following the rules to avoid dangerous consequences, all while delving deeper into the enigma surrounding their friends at 21BUT22.