The legendary Lassiter was first introduced in best-selling novelist Zane Grey's landmark Western Riders of the Purple Sage. With Ambush for Lassiter, Grey's son Loren continues the exciting saga. Lassiter and his partner Borling are sentenced to 25 years in prison after being convicted of a killing they had no part in committing. But with some daring ingenuity they manage to escape from behind bars-only to see their efforts thwarted by treachery.