Hello, Darkness - Sandra Brown

From the #1 New York Times bestselling author of Seeing Red comes Hello, Darkness, a brilliant, fast-paced tale about a woman haunted by her past and caught in a nightmare that threatens to destroy her future.
For Paris Gibson, her popular late-night radio show is both an escape and her one real contact with the outside world. To her loyal listeners, she is a wise and trusted friend who not only takes their requests but listens to their problems and occasionally dispenses advice.

Paris's world of isolation is shattered when one listener—a man who identifies himself only as "Valentino"—tells her that the girl he loves jilted him because of Paris's on-air advice. Now he intends to exact his revenge: first he plans to kill the girl—then he will come after Paris.

Joined by the Austin police department, Paris plunges into a race against time in an effort to find Valentino before he can carry out his threat. To her dismay, she finds that she must now work with crime psychologist Dean Malloy, a man with whom she shares a history. His presence arouses old passions, forcing Paris to confront painful memories that she had come to Austin to forget.

As the clock ticks down and Valentino's threats come closer to becoming reality, Paris finds herself forced to deal with a killer who may not be a stranger at all.

Tense and compelling right up to the chilling climax, Hello, Darkness is suspense at its very best, by the author USA TODAY dubbed "a masterful storyteller, carefully crafting tales that keep readers on the edge of their seats."