Redshift is a special spaceship designed to fly in hyperspace. The ship has a spherical shape and several levels, on each of which time flows at its own speed. The speed of light on board the ship is approximately 10 m/s, and the speed of sound is 6 m/s. Retreating objects change their color to red, and approaching objects change their color to purple. Gravity bends light waves, so smooth surfaces appear concave or convex. During the flight of the Redshift, passenger Jenny Saunders was killed on board, followed by one of the crew members disappearing. Jason, the first mate, undertook to investigate the circumstances of these incidents and came to an incredible conclusion. (Ank.fantlab.ru)