The Necessary Evil series by Onley James is a dark, addictive, and unexpectedly heartfelt set of MM romantic suspense novels that follow the Mulvaney brothers — a group of brilliant, morally complex men raised to be vigilante killers. Each book focuses on one brother as he finds his own person.

What makes this series stand out is its balance: the stories are dark but never joyless, violent but deeply emotional, intense yet full of humor and soft moments. Every book combines mystery, action, and romance, with relationships that feel both tender and explosive.

If you enjoy morally gray characters, found family dynamics, unhinged-but-devoted love interests, and fast-paced plots wrapped in dark humor, the Necessary Evil series delivers all of that and more