The New Girl by Harriet Walker. Published by Ballantine

Margot is a magazine editor, and a new mum, in short she seems to have it all. Her world loses some of its shine when her best friend, Winnie loses her own baby. Add to that, Maggie , the temp that covered for Margot while she was on maternity leave. The temp that suddenly seems to be vying for a much more permanent position. With a cyber stalker only adding to her stress, Margot feels like her carefully constructed facade is about to come crumbling down. This is far from an original story idea, but Walker keeps it fresh with outstanding characters and a few surprises