Sam leaps into Jim Ellison, and has to learn how to deal with Jim's Sentinel abilities not to mention having two Guides before a murderer kills Blair, Simon, and the rest of the Major Crimes Division.

Dr. Sam Beckett leaps into Det. Jim Ellison. Can he stop the Iceman? Can he stop Blair Sandburg from lying about his dissertation? Four lives are at stake if he fails, and one of them is his own.

What really happened in The Sentinel, Too. The Sentinel receives a little help from Sam and Al.