Iris was once everything to her granddaughter. But now she's losing her grip on her precious memories, and it's too late for Tess to ask for the advice she needs now more than ever.

Tess is stunned to discover she's pregnant - but in spite of her relationship breakdown she knows she wants the surprise baby. Alone and uncertain, she turns to Gigi, a kindly stranger at Iris's nursing home.

Gigi is bearing her own secret sadness. Whilst her family thrives, she hasn't been happy for years. Should she leave her husband and find a new life just for her?

Then Tess discovers a case filled with Iris's secret letters. The missing pieces of her life could hold the answers she and Gigi need . . .