Spooks: The Greater Good is a happy tale of fairies and unicorns, living together in "Happy Paradise Land". Everyone is nice to everyone else and there are always lots of cakes for tea.
On the other hand, this might be a lie. Why should you trust me? Why should you trust anyone? After seeing this film I won't be doing much trusting. Everybody is pretty horrible one way or another, but then again the TV show this is based on wasn't big on Rainbows and Cupcakes either.
If you like twisty stories with a bit of action thrown in, or you enjoyed the TV show, then it is well worth a trip to the cinema.