They’re rugged and powerful intelligence agents with a desire for sexy, feisty women.

As one, they’re unstoppable. Together, they’re invincible.

When security and intelligence is threatened, the partners of the Invincible Intelligence and Security Group come to the rescue. They save lives. They challenge each other. And they protect the strong women they fall for. The men and women of the invincibles get the job done.

In this four-book boxed set, Slade will take you on a global journey of espionage, passion, danger, and desire. As these fearless operatives conquer perilous obstacles, one thing is crystal clear: They’re invincible.