When a man is found in his apartment, appearing to have committed hara kiri with a samurai sword, Boston Homicide Detective Jack Cade suspects more is going on than what it appears. The department's criminal profiler has left and a new guy is taking his place. At first, Cade is skeptical of Dr. Michael Di Santo. Di Santo seems so absent-minded and too neurotic to be effective. But he is brilliant and hot and Cade finds himself falling hard and fast, both in lust and in love. The attraction is mutual, although Michael's past demons haunt him, keeping him from getting too close. Together, they begin to unravel Michael's emotional knots even as they close in on a killer, another brilliant, wily person whose sights are now set on Michael.