Amelia has broken up with Charlie – the love of her life – and she’s agreed to try to mend her broken heart by going on a roadtrip between LA and Vegas, with a special treasure hunt thrown in.

Havana 2075: after the death of her beloved grandmother, Harper is tasked with packing up Katie’s flat – but while she’s there she discovers a box of love letters written to the mysterious Blue, who saved her grandmother’s life in the fictional bombing of London in 2014.