Today's daily heroic mission includes a secret side quest, that awards a secret chest as well as fleshes out Praedyth's backstory.
Also, the first ghost is found by not following the normal path as soon as you enter the Vault and heading left down the "hole". Apologies, I realized people might not know where that area is.
It should be noted that completing this side mission will likely lead to a larger quest, per this reddit thread!
https://www.reddit.com/r/DestinyTheGame/comments/3nopdt/found_memory_vault_of_glass/
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