With the phone to her ear and her eyes on the TV, Terry Strada is unable to comprehend how her life is about to change.
Her husband is on the 104th floor of the North Tower of the World Trade Center and their four-year-old is supposed to start nursery school.
A BBC News Long Form Audio production.
Host: Jane McMullen
Series producer: Neal Razzell
Additional production: Sally Abrahams, Keiligh Baker, Nik Sindle
Editor: Matt Willis
Music: Thomas Ross-Fitzsimons
Sound design: Charlie Brandon-King
Production management: Phoebe Lomas
Radio 4 commissioning executive: Tracy Williams
Radio 4 commissioning editor: Dan Clarke