Cospiracy and murder mark Winn’s fast-paced installment in A Mack and M Mystery, featuring Private Investigator Mackenzie Sampson. After his fiancee Jamie Lee dies unexpectedly, Boston Homicide Detective Mackenzie begins to drown his sorrow in alcohol and Xanax. But the drug and alcohol soon takes a toll on his mental health, resulting in his dismissal from the police department. Trying to prove his worth, Mackenzie starts his own private investigation firm. But keeping the business afloat is not that easy. Desperate, he takes on a suspicious case of homicide against his better judgment and finds himself entangled in a deadly conspiracy. Winn layers his story with hidden depths, expertly portraying Mack’s struggles with alcohol, Xanax, and grief of losing his fiancee to the tragic accident. A mystery that starts with Bill Stewart’s suspicious murder quickly turns into a nail-biting, cat-and-mouse game between Mack and the criminals. Mack, M, and Pauline’s endearing bond, unexpected plot twists, and plenty of suspects, and intriguing human drama keep the reader invested. Themes of strength, grief, and enduring friendships play out nicely in the main story arc, as Mack navigates his individual burdens. Fans of fast-paced thrillers will delight in this exciting tale of betrayal, murder, and intrigue.