Abandoned in death - J.D. Robb

Say goodnight, baby darling

Three young women have gone missing. They're all pretty, mid-twenties - someone clearly has a type - but no one links their disappearances until Lauren Elder is found lying peacefully on a bench in a children's playground. She is neatly dressed, a wide black velvet ribbon covering where her neck has been precisely slit. Her hands are folded over a note which reads BAD MOMMY. 

When Lt Eve Dallas is brought in to investigate Lauren's murder, she quickly uncovers the links to the others, but can she find out enough about the missing women and the killer who links them before he strikes again...?