Sudden Mischief, the 25th Spenser novel, finds Robert B. Parker"s seemingly ageless sleuth once again engaging Boston"s bad guys and sorting out life"s moral dilemmas, all (or mostly) in the name of love. When Spenser"s girlfriend, psychiatrist Susan Silverman, asks him to investigate charges of sexual harassment leveled against her ex-husband, Brad Sterling, the detective agrees, though the assignment "shows every sign of not working out well." As the sexual harassment allegations melt like April snow, Sterling drops out of sight, a dead body appears in his office, and Spenser discovers a murky slush of clues that suggest Sterling"s work as a marketing genius for local charities has been a front for some truly despicable criminal activities. As always, the more-than-slightly-shady Hawk is on hand to help Spenser sort the good from the bad, but Spenser is left to his own devices when it comes to making sense of the emotional havoc the case creates in his relationship with Susan. And what devices they are: emotionally mature and physically dynamic, Spenser once again proves himself as detective, friend, lover, and human being as Sterling"s reappearance forces Susan to examine her past and her conscience while searching for her own autonomy. As always, Spenser endures as an intelligent, ethical, and poetic private eye, even if his endless middle age seems a bit supernatural. Parker"s nimble, Spartan prose suits a character who carries his years in wisdom rather than body fat. If the heart of any truly great detective series is a truly great detective, Sudden Mischief and the rest of Parker"s Spenser novels surely fit the bill. --L.A. Smith