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Sense The Unseen 
Feat 14
Source Pathfinder Advanced Player's Guide
Trigger You fail a check to Seek
When you look for foes, you notice the slightest of cues. Even though you failed at the triggering check, you automatically sense any Undetected creatures in the area where you're Seeking, making them merely Hidden to you.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
InvestigatorThis indicates abilities from the investigator class.
RangerThis indicates abilities from the ranger class.
RogueThis indicates abilities from the rogue class.