Vanishing Day (Logan McKenna #4)

Viciously attacked by an unknown assailant, Logan's new neighbor, a young mother, clings to life in the ICU, her three-year-old daughter the only witness to the attack. 

Logan soon discovers her friend isn't who she said she was. Without any ID, the police investigation stalls. Logan holds the only clue, but has no idea what it means or how dangerous it is. That's never stopped her before, but this time her drive to uncover the truth draws the killer towards her. Before she realizes the danger, Logan's in so deep, she may never be able to claw her way out.