The Broadhurst sisters, book editor Emily and stay-at-home wife and mother Jill, are suffering severe cases of the-grass-is-always-greener syndrome.

So, when Melbourne Cup Day rolls around, they decide to have an each way bet by trading places. But then they find they have to cope with an elusive pregnancy test, vegetable-flavoured punch, flying carpet bowls, a predatory femme fatale, a foul-mouthed three-year-old, and argumentative and accident-prone teenagers.

Spend a madcap Melbourne Cup with the Broadhursts, and find out if the race that stops the nation can get their lives back on track.