With her marriage in danger of falling apart, Joanna returns home to the beautiful but dilapidated Mulberry Farm Cottage in rural Dorset, where her sister Harriet is struggling to keep the Farm afloat and cope with their eccentric mother.

When Joanna discovers a bundle of love letters in the attic, written by a watercolourist named Emmy, she is intrigued and sets out to discover Emmy's true story. Emmy's letters take Joanna to the picturesque alleyways and bridges of Lisbon, Prague, and the most romantic place of all: Venice - where a whole new magical world seems to unfold in front of her.

Meanwhile, back at Mulberry Farm Cottage, a mysterious prowler adds to Harriet's problems and interrupts her search for a perfect partner. Will she ever find true love? Where will Emmy's mesmerising pathway lead? And more importantly, will Joanna and Harriet be able to rescue the cottage and finally be able to re-discover their sisterly bond?