But you should absolutely have previously played through the main game as the action begins in the middle, namely
* SPOILER WARNING FOR THOSE WHO the main game NOT BY HAVE !!! *:
at the Selle, where Joel was seriously injured and Ellie tries to provide him. Specifically the action takes place during the time jump, where there was the change of seasons from autumn to winter in the main game.
Ellie puts the injured Joel into an abandoned department store and try to find somewhere a first-aid kit to sew the wound in this. While they thus embarks on the search, she remembers a day in her past, where her best friend Riley leads them into a department store that the one where Ellie is just, looks very similar to show her something ...
To further story I want nothing to say further, it plays itself. If you have the main story loved you has excited the atmosphere and did you afraid of almost every corner, because you a bunch of fears infected, you will exactly those feelings again at " Left Behind "experience. Finally, one understands partially Ellies beings better and when you play again after the main story, you can see here and there again some allusions to the story that is told in the DLC.
Gameplay Technically're all here: Sneak past or fighting with infected persons and bandits, various possibilities for producing articles (But no weapon upgrades) and smaller puzzles.
The soundtrack, with its 25 tracks is also absolutely great.
Simply a must for all fans of the game.
edit: honest to the people ... 15. If you are 15 too expensive, ok. But if you the price does not fit and are thrilled by their DLC anyway, why then 1 Star? Apart from that, 15 are for the work that has been reingesteckt since, more than right. You can not get everything für'n apple and chicken feed nunmal.