THE LAST SPENSER NOVEL COMPLETED BY ROBERT B. PARKER　 With Sixkill, the thirty-ninth novel in the venerable, bestselling Spenser series, the Boston P.I. meets Zebulon Sixkill, a young man whose lack of discipline is more than made up for by his quick way with a gun. Though this is the last Spenser novel Parker completed, readers will rejoice to find the tough-but-tender gumshoe at his roguish, crime-stopping best. On location in Boston, bad-boy actor Jumbo Nelson is accused of the rape and murder of a young woman. From the start the case seems fishy, so the Boston PD calls on Spenser to investigate. The situation doesn't look good for Jumbo, whose appetites for food, booze, and sex are as outsized as his name. He was the studio's biggest star, but he's become their biggest liability. In the course of the investigation, Spenser encounters Jumbo's bodyguard: a young, former football-playing Native American named Zebulon Sixkill. Sixkill acts tough, but Spenser sees something more within the young man. Despite the odd circumstances, the two forge an unlikely alliance, with Spenser serving as mentor for Sixkill. As the case grows darker and secrets about both Jumbo and the dead girl come to light, it's Spenser — with Sixkill at his side — who must put things right