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Two couples arrive in Sicily and the Stockholm archipelago for a holiday home swap, but unsettling details about their new houses make it hard to relax.

A shocking discovery puts Carl and Helene on edge. Scarlett grows suspicious of Adam after an awkward surprise sours their romantic Stockholm lunch.

As a long-held secret unravels, Helene's sudden choice puts Carl in a perilous position. Scarlett receives devastating news that shatters her world.

In the wake of a spiraling chain of events in Sicily, a twisting web of lies and scheming threatens to reveal a disturbing — and deadly — truth.