Vital Signs (Emergency! #9)
Bobby Hutchinson

And then a little boy badly in need of a warm, caring home appears on her ward, and social worker Roy Zedyck walks into her life. Suddenly Hailey's heart is out of control--with love for both the child and Roy.
Gentle Roy, who feels as deeply for Hailey as she does for him. And then chooses to deal Hailey's hopeful heart a blow that will send her reeling...
--from back cover of the book