Longest Day (Dr. Who Series)
Having landed on the strange planet of Hirath, the Doctor and Sam become separated as they both strive to understand and help the inhabitants of a world where different time zones mean that the planet's biosphere is out of control and heading for disaster. More
Longest Day is an original novel written by Michael Collier and based on the long-running British science fiction television series Doctor Who. It features the Eighth Doctor and Sam.
Hirath is a planet ravaged by overlapping time fields. There are those who seek to exploit this for monetary gain...then there's an invading alien race out to just kill.