Call an Angel — Hazel Fisher

Widowed Sister Lisa Smith entrusted her small daughter Christine to her mother-in-law Betty when she was working as branch Superintendent to the Call an Angel agency in Suffolk. So Lisa was horrified when Canadian Dr. Dan Jordan brought Christine home from the park one day.
From then on, Dan seemed to be everywhere in Lisa's life, involving her in the Cardiac Unit, making friends with Christine and introducing her to his small withdrawn son Steven. But Anne-Marie had prior claim, and she was working with Steven … so what options did Lisa have left?