Callum Tierney sees everything.

Every lie. Every micro-expression. Every secret his family's enemies try to hide. As the youngest Tierney brother, he built his empire behind a screen — mapping networks, cracking codes, keeping the Brotherhood three steps ahead. His system is flawless.

Then Bianca Marcello walks into Dublin.

She's Luca Marcello's sister. Sharp, calculating, and dangerously beautiful. Sent to strengthen the fragile alliance between the two families — or so she says. Callum knows she's spying by her second day. What he can't figure out is why she told him the truth when he asked.

Bianca has spent her life being useful — to her brother, to the family, to the Camorra empire that would discard her the moment she stopped performing. Dublin was supposed to be another mission. Callum was supposed to be another variable. But the quiet brother with the wire-rimmed glasses sees through every mask she's ever built — because he's wearing the same ones.

When a Russian threat forces them to work side by side, two systems thinkers discover they run on identical code. The analysis stops. The feeling starts. And neither of them has a protocol for what comes next.

But Luca wants his intelligence report. The Brotherhood wants answers. And when Bianca's secret detonates, Callum must choose: expose the woman who broke his system, or find the angle no one else can see.

In the Tierney Brotherhood, the quiet ones were always the most dangerous.

Ash & Lies is Book 5 in the Tierney Brotherhood series. Dark mafia romance with an HEA. Features: forced proximity, spy heroine, dual POV, and a hero who sees everything except what's right in front of him.