Robert B. Parker, Boston's best-known mystery writer, has Spenser (of course) going back to 1973 and Jesse Stone, (created in 1997) his ex-LAPD homicide detective who wanted to escape his vices and wind down in our sleepy state. No such luck. It's Jesse who must solve the murder of a radio celebrity in the harborside town of Paradise, in Parker's latest novel, "High Profile." This is the occasion for Parker to speak Tuesday March 27 at Boston University's GeorgeSherman Union (Metcalf Hall, second floor). In an e-mail exchange, we asked Parker what he'd be talking about and he replied "mostly me." We couldn't help but wonder if that got a little old some times. Said Parker: "I've been retracing old ground since before it wasn't old. What makes it tolerable is that I don't give a speech. I do essentially Q&A which allows the gig to change, if very slightly, from appearance to appearance. I'm still playing the same music, but I can improvise an occasional variation. On the other hand, talking about 'me,' is still less boring, I find, than talking about someone else." Members of the general public can pay $25, but if you're a BU student or Member of the Friends of the Libraries you can skate in for free. Starts at 5:30 p.m.