In Zeltserman's run-of-the-mill second Bill Shannon mystery (after 2007's Bad Thoughts), Shannon, now a PI in Boulder, Colo., investigates the murder of two college students-Taylor Carver and Linda Gibson, bludgeoned to death in the bedroom of the off-campus condo they shared-at the behest of the condo owner, who's being sued for lax security. After his former colleagues on the Boston police fo...