Tick Tock Time's Up by Mark Pettinger

The Hardwicks are a relatively normal suburban family. Even after their young son, Joshua, recovered from a serious illness, Steven and Joanna Hardwick tried their best to ensure normality returned to their lives once more. Then Joshua was abducted. DCI Priest and his colleagues pick up the investigation, with a single priority….find Joshua and return him to his parents. Alive. When the kidnapper unexpectedly makes contact, everyone's hopes are raised. That is until the Hardwicks realise that their nightmare is not over, but the worst is yet to come. With few clues to follow, Priest appears to be always one step behind. But one thing he knows for sure; the clock is ticking, and time is running out.