Command of Silence by Paulette Callen

Two children have been stolen at different times out of the same household, one an infant from a bedroom, the other from a playground.

Into this baffling case enters Shiloh & Company. Well known for investigative effectiveness to a cooperative if uneasy police department, unique among detective 'agencies,' Shiloh & Company is composed of disparate personalities--Sugartime, Hester, Isadora, Lance, Olive, Hawk--who reside in the single person of Shiloh. Shiloh's assorted identities, born out of extreme childhood trauma, have acquired a collective instinct, a priceless gift in detective work: an unerring tuning fork for the truth.

Shiloh has been nursed back to functioning health and sanity by lesbian therapist Ray Martinez, still intent on integrating all the self-protective personalities. But this case is lethal to Shiloh's very identity: a crime involving children cuts to the heart of what first brought Shiloh to Ray's attention. In pursuing this mystery, the fragile mental health and fragmented existence of Shiloh will be tested to its limit.

Allow yourself time for Command of Silence. Once you pick it up you will be reluctant to leave the compelling world of Shiloh and Company.