Concerto of Crows and Cowards by Liliana Hart

No one knows heartbreak like Jade Jax. After losing her husband to a tragic death, she doesn’t believe love can happen twice. The job becomes her life, and being an agent for Dynamis Security almost fills the void she once dreamed would be filled with family.
Max Devlin has loved Jade for years, even when she wasn’t his to love. He never thought she’d notice him in that way, but fate plays a helping hand when they’re thrust into a high stakes mission of cat and mouse, having each other’s backs like old times.
With life and death on the line, Max realizes Jade is worth risking it all for. But happily-ever-afters aren’t always possible. Jade has no desire to ever love again. Not when she knows how painful it can be.