In the Tasmanian bush six contestants battle it out to win $250,000. Only five finish.

In Bass Strait the Blue Gazelle yacht tackles fierce winds, high waves and a phantom vessel in its race to win the Tattersall Cup.

In London a fashion designer learns about a Belarussian scientist possibly involved with a deadly technology.

In Hobart a search party is launched for a missing sailor.

At the centre of the investigations are two feisty sleuths, Galina Ivanov and Charlotte Harmon, looking for clues which could save their partners and stop the spread of a devastating weapon.

Can they find them before all hope is lost?