Please beware we will not spoil this episode but will point to events from the Previous seasons.
When we first met up with Rick Grimes and the rest of the cast in Season one life was about mere survival but as time has gone on the idea of rebuilding the world has come into the forefront of people's desires. This led the group to what they thought would be their "Sanctuary". As we now know this ended up being more of a nightmare then anyone really anticipated, though not from the walkers but instead from other survivors. This examination of power and survival permeates this episode as we find out what happens in a direct continuation of the end of Series 4 and if the Terminus crew really are "Screwing with the wrong People".
For those of you loyal watchers then the pay off is hugely rewarding. The tension that is created from the last season comes to a head and should grip most viewers throughout the episode. The pacing feels forgiving as the story ebbs and flows but be warned this is not for the faint hearted but what you expect anything less form The Walking Dead.