Cath Crowley's Words in Deep Blue tells the story of Rachel, who left a love letter for her crush, Henry Jones, tucked in his favourite book in his family's bookshop the day before she moved out of the city, but never received a reply. When Rachel returns, she tries to avoid Henry, but in need of distraction from the death of her brother, Rachel finds herself working side by side with Henry in the bookshop, where they are soon exchanging letters between the pages.