Helen seems to have the perfect life. She's happily married to the successful architect, who works with her brother Rory who's married to her best friend Serena. She lives in a beautiful London home being renovated ahead of the birth of a much-awaited first child.

But there are hints that things aren't what they seem when Helen has to attend her first antenatal class alone. Her husband, brother and sister-in-law all cry off at the last minute, so Helen is relieved when she's befriended by Rachel even if they appear to have nothing in common.

Rachel is a loud, brash single mother-to-be and she is determined to be Helen's friend. She's over-attentive, always around, and she wants to know everything about Helen's family.

Why is she so interested? What does she want? What secrets are being hidden? How can she disrupt their lives?

It's a fantastic read. Helen is a compelling narrator and the twists and turns ultimately come thick and fast. Loved it!