In this final book in the trilogy, Mimi and family are returning from the countryside to Notting Hill but not to their former house which now belongs to Clare. The neighbourhood is up in arms about the number of massive subterranean extensions going on so Mimi gets involved in some journalistic investigations into these "iceberg houses" and falls in lust with an eccentric female performance artist. Meanwhile, Clare is hoping to add to her family and wants Mimi's husband, Ralph, to be the sperm donor again.
While cleverly satirical in parts, the plot has too many implausible moments and too many of the characters evolve from unlikeable to ghastly.
Mimi and Clare live on the communal garden in Notting Hill where it is very much a case of the haves and have-yachts. While Mimi's interest is piqued by the neighbourhood's new billionaire, Clare is keeping an eye of some illicit going-ons, of the adultery and construction kind. Each is striving to be the best Notting Hill mummy - Mimi just needs the six-figure income; Clare the baby.