The Grandfather Infestation (novel)

 was ''the seventh novel in the Lethbridge-Stewart series. It was the first of the series to feature Alistair Lethbridge-Stewart as a brigadier and not a colonel. Additionnally, it was the first to feature the Home Army Fifth Operational Corps, which was a British military organisation led by Lethbridge-Stewart and investigated alien actions.''

Publisher's summary
to be added

Characters
to be added

Continuity
DN6 pesticide is used on the island of Strommach (TV: Planet of Giants)