Darkly, Madly Duet Series by Trisha Wolfe

He challenged her sanity. She shattered his reality. They dared each other. .. to the brink of madness. A dark and twisted maze awaits criminal psychologist London Noble when she falls for her patient, convicted serial killer, Grayson Pierce Sullivan. As she unravels the traps, her sanity tested with each game, she's forced to acknowledge the true evil in the world around her. *Trigger warning.

Duet: a performance by two. But who is acting, and who is devolving? A buried past is unearthed, and Grayson Sullivan—AKA The Angel of Maine—retaliates against the system who made him, deploying psychological warfare on the woman who initially set him free. Dr. London Noble probes deep into the mind of the killer she’s fallen for, searching for answers, as a copycat killer threatens their unity. Are they partners, lovers, or enemies? One final trap will reveal all.