It may not be his best, it's the third in a series (but afaik they can be read as stand-alone novels), it's really expensive. But i'd like to nominate:
Jeffery Deaver - XO (third in Kathryn Dance series).
Originally Posted by Amazon.com
COUNTRY-POP INGÉNUE Kayleigh Towne’s career is just reaching new heights with her huge hit single “Your Shadow”—but increased fame is also bringing unwanted attention. An innocent exchange with one of her fans, signed with an “XO,” leads Kayleigh into the dangerous and terrifying realm of obsession.
Edwin Sharp thinks Kayleigh’s songs contain messages that speak directly to him. Despite her clear rejection and threats from lawyers and law enforcers, he remains convinced that “Your Shadow” was written just for him, and he announces he’s coming for Kayleigh. Then a potentially fatal accident occurs at the concert hall where Kayleigh is rehearsing for a triumphant hometown performance, and she is convinced that someone—maybe Edwin—was there watching her from the darkness.
True to his word, Edwin Sharp soon makes an ominous appearance in town, and California Bureau of Investigation Agent Kathryn Dance, a friend and fan of Kayleigh’s on vacation in Fresno to attend the show, intervenes on her behalf, drawing Sharp’s frightening attention to herself. That night a member of the road crew whom Kayleigh had once dated is murdered in an eerie echo of an image from her chart-topping song. As more deaths loom on the horizon, Kathryn Dance must use her considerable skills at investigation and body-language analysis to stop the stalker and save more innocent victims. But before long she learns that, like many celebrities, Kayleigh has more than one fan with a mission . . .
This nail-biting thriller from suspense master Jeffery Deaver speeds along over just three short days, filled with terrifying twists that will keep readers held in rapt suspense until the final shocking revelation.