Instruct: Classify a review as either positive or negative.
Query: New characters, same high quality

The writers of MI-5 have kept up their high quality into the fourth season. Characters come and go, but the series never misses a step and keeps this viewer interested, entertained and looking forward to more. The variety of credible threats to the UK never ceases to amaze me.This is the ONLY Television series I have ever purchased, and I share it with a couple of friends who are also hooked on MI-5!