Committed is a standalone thriller featuring Ellen McGinley, a former undercover operative and asset of the CIA. She's a badass protagonist in a male-dominated working environment that can more than hold her own against the patriarchy which makes you really root for her throughout. She also suffers from PTSD due to an incident in her past and the trials and tribulations this causes and the impact it has on her day to life is handled realistically and sensitively, with it being one of Doctor Merritt's particular areas of speciality in terms of patient treatment.
This is one of those immaculately crafted, exceptionally well-paced thrillers with exactly the right amount of action, twists, turns, intensity, character development and exposition. I have read almost all Chris Merritt books and must say that while they are all compulsively readable, he hit a whole new level with this one - when everything comes together beautifully and merges into a tense, insanely palpable tale with characters you care about whether they are to be loved or loathed, you can't get any better than this. Highly recommended.