Wicked Business: A Lizzy and Diesel Novel  by Janet Evanovich 

When Harvard University English professor and dyed-in-the-wool romantic Gilbert Reedy is mysteriously murdered and thrown off his fourth-floor balcony, Lizzy and Diesel take up his twenty-year quest for the Luxuria Stone, an ancient relic believed by some to be infused with the power of lust. Following clues contained in a cryptic nineteenth-century book of sonnets, Lizzy and Diesel tear through Boston catacombs, government buildings, and multimillion-dollar residences, leaving a trail of robbed graves, public disturbances, and spontaneous seduction.