From the back:
The powers of the mind offer huge rewards but also great risk for Travellers. Traveller: Psion offers a detailed investigation of psionics, with vastly extended options for psion careers, testing and training in psionic capability, new talents and powers, new equipment, and rules for integrating psionic characters with starships. Traveller: Psion also introduces guidance on time and dimensional travel, with new career options for creating agents of temporal and dimensional organisations and an examination of how psionic effects are used in manipulating the fabric of time and alternate realities. Tou will also find within this book career oportunities for mystics and psionic renegades, along with options that can be integrated into any standard psionic careers.
Traveller: Psion - It's all in the Mind...