See the Unseen  [two-actions] Spell 2

Concentrate Manipulate Revelation 
Source Player Core pg. 355
Duration 10 minutes

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Your gaze pierces through illusions and finds invisible creatures and spirits. You can see invisible creatures as though they weren't invisible, although their features are blurred, making them concealed and difficult to identify. You can also see incorporeal creatures, like ghosts, phased through an object from within 10 feet of an object's surface as blurry shapes seen through those objects. Subtler clues also grant you a +2 status bonus to checks you make to disbelieve illusions.

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Heightened (5th) This spell has a duration of 8 hours.

Truesight  [two-actions] Spell 6

Concentrate Manipulate Revelation 
Source Player Core pg. 364
Duration 10 minutes

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You see things within 60 feet as they actually are. The GM rolls a secret counteract check against any illusion, morph, or polymorph effect in the area, but only for the purpose of determining whether you see through it (for instance, if the check succeeds against a polymorph spell, you can see the creature's true form, but you don't end the polymorph spell).