Baby, It’s Cold by Jaye Maiman

As a bitter winter grips New York City, Private Investigator Robin Miller is catapulted on a bone-chilling quest to save a friend's child from a horrifying death. With a vicious kidnapper on the loose and one child already presumed dead, Robin has no time to waste. The investigation rushes ahead at breakneck speed, propelling her on a collision course with a cold-hearted killer...and a former lover.