The Midnight Lock by Jeffery Deaver (Lincoln Rhyme #15)

A killer without limits
He comes into your home at night. He watches you as you sleep. He waits.

A city in turmoil
He calls himself 'The Locksmith'. No door can keep him out. No security system can catch him. And now he's about to kill.

A race against time to stop him
Nobody in New York is safe. Now it's up to Lincoln Rhyme to untangle the web of evidence and catch him.

But with Lincoln under investigation himself, and tension in the city at boiling point, time is running out...