(aka: Vanguard from Alpha)
An abortive spying mission results in the death of his best friend. Now Leslie Tyne begins his investigation but is rapidly caught up in political intrigues between humans and the alien Rosk. When he finds out that the Earth is about to be invaded. he has to tell someone, but he has no idea who is to trusted.
This title was serialised in the following publications:
Publication history in print:
- Equator (aka: Vanguard from Alpha) (published in The Future Makers omnibus by New English Library in 1969)