Twin Tango - H Q Kingsley

The Henderson Twins have been a plague on Brooklyn for years.
Flooding the city with drugs and guns, they might possibly be head of the most powerful criminal organization on the east coast.
After 12 years, Skylar has finally made it into his dream job as an FBI agent. His first mission: take down the Henderson Twins.
When he goes undercover to do just that, he discovers there's more to the twins than just corruption and chaos. And though the twins are like night and day, he finds himself drawn to them both. He finds himself caring for them both.
But nothing comes before the mission. Skylar's duty is to the law, and he'd never let anything compromise that, not even his heart... would he?

The Cop & the Criminals reading order:
Twin Tango (Book One)
Twin Trouble (Book Two)
Twin Truce (Book Three)