The Killing Hour - Lisa Gardner

Each time he struck, he took two victims. Day after day, he waited for the first
body to be discovered--a body
containing all the clues the investigators needed
to find the second victim, who waited...prey to a slow but certain death. The clock
ticked--salvation was possible.

The police were never in time.

Years have passed;
but for this killer, time has stood still.
As a heat wave of epic proportions descends,
the game begins again. Two girls have disappeared...and the clock is ticking.

Rookie
FBI agent Kimberly Quincy knows the killer's deadline can be met. But she'll have
to break some rules to beat an exactingly vicious criminal at a game he's had time
to perfect.

For the Killing Hour has arrived....