A Waltz on the Wild Side (The Wild Wynchesters) by Erica Ridley

Saving the day has never been so fun when two enemies must fight their attraction and work together. 

Advice columnist Miss Vivian Henry hates how the Wild Wynchesters flaunt so many privileges ordinary people could never emulate. But when her beloved cousin goes missing and the authorities shrug, Viv has no choice but to beg for help from the vigilantes she despises. 
 
Aspiring poet Jacob Wynchester prefers animals to people. He’d rather stay behind the safety of a quill than interact with prickly clients. But when he's appointed lead investigator, Jacob finds he admires Vivian's resourcefulness and intelligence—including the sharp wit he must parry. As they team up to rescue her kidnapped cousin, they discover just how compatible they are.
 
Together, they must not only save the day, but also decide how far they’re willing to go to be who they really are. And determine whether their partnership is a mistake… or the missing piece that completes them.