Denver cabbie Brendan Murphy--known to all as Murph--has two goals in life. First, to earn no more than it takes to keep his bohemian lifestyle afloat. Second, to never, under any circumstances, get involved in the lives of his passengers. In The Heart of Darkness Club, the third in novelist Gary Reilly's Asphalt Warrior series, Murph once again fails spectacularly at his second goal the minute he picks up a mover named Trowbridge. Movers in Murph's world are not to be confused with movers and shakers. Trowbridge pays his fare with a crisp five-dollar bill. Later, Murph finds an enigmatic handwritten note on the bill. Murph can't get the message out of his head, believing it was specifically directed at him. He sets of in search of his passenger, the meaning of the message, and the inner workings of his very soul.