Five years ago, Josephine "Mockingbird" Caruso belonged to an all-female black-ops military group named Hera Force—a team tasked with bringing down terrorists like the enigma dubbed the Chessmaster. But the faceless criminal mastermind had other plans and single-handily destroyed the operation, ruining the women’s military careers and their lives. Ex-Delta Force operative Detective Lincoln Sullivan reports to the scene of a mass-murder, learning all too quickly he knows the victims. The killer has left behind a deadly missive just for him: Find the Mockingbird or more will die. Lincoln flies to New Orleans where Jo lives with her twin brother. Lincoln and Jo had once been co-operatives and lovers, however the fallout from Hera Force's destruction left what little relationship they had in tatters. Jo has no desire to work with Lincoln again, but the threat to her life and the remaining two operatives, Nadia “Phoenix” Roth and Jade “Dragon” Delacour, force her hand. The four former teammates are thrust together once more. There are unknown forces moving in the background and an old enemy is about to return with a vengeance. Tensions between the ex-lovers come to a head when Lincoln learns his partner is an Army agent working under Hera Force’s top general, a man who's not all that he seems. With each step Lincoln and Jo take, they are met with death and destruction. Buried lies and half-truths begin to unravel Jo’s shaky trust in Lincoln until all is brought to light. When the killer strikes, Jo is faced with a hard choice, be the leader she was born to be, or lose Lincoln forever.

A maniac developing a fantastical drug wants one more thing to finalize the project—a test subject who fits all the parameters. But that test subject is as elusive as her namesake. Ex-SAS operative Mitch Edwards has been on the run since the moment he was framed for treason by someone in the British government. But he’s never forgotten the flamboyant and seductive CIA operative with the tongue of a thousand languages. In a bar in Cancun, Mexico, Mitch comes face to face with her once more, and with her comes the full force of her enemies. Reinstated Hera Force linguist and assassin, Nadia Roth, code named Phoenix, has no memory of Mitch Edwards, or of their affair before her team’s disastrous mission. Her traumatic brain injury is tricky that way. But something about this man sets her on fire and tickles the back of her mind. Her Hera teammates remember him, so why can’t she? Mitch partners up with Hera, with the sole intent of locating those hell-bent on killing him and all who are associated with him. Yet more is at stake than their lives. A traitor hides among their ranks, one who has been revealing all their secrets to an enemy determined to procure this special drug and Nadia for his scheme. Hera goes into operation mode, doing what they were created to do, but someone is watching, and the team finds themselves trapped behind enemy lines with no way out. Will Nadia ever remember the man she once loved, or will they perish with the secret between them?