The Fourth Sense by Kat Parrish

There are five senses—taste, touch, sight, smell, and hearing. Not everyone is born with all five senses and some are born with a sixth. And then there’s Vetiver Quinn. She only has five senses but her extraordinary ability to use her “fourth sense” makes her special. Able to read the “olfactory aura’ of anyone she meets, Vetiver uses the insights she gains to craft everything from love potion-laced perfume to powerful protective compounds. And then one day Peter Eliades enters her shop, flashing a badge and asking a favor.
It’s not every day someone wants your help saving the world.
Vetiver Quinn has only five senses but one of them is a little “extra.”