Longing for the place he once called home, Supreme Archangel Aziraphale has taken the risky decision to return to Earth and visit his beloved bookshop once more. Whilst he has an official excuse for his excursion, the real motive behind his return remains blurry even to himself, in that he has long since accepted that the individual who lies at the heart of his homesickness will no longer be around. Consequently resigned to the idea of never having his heartache allayed, Aziraphale resolves to use the visit to bid a proper farewell to the remains of his old life, only to have Muriel hand him a book which stirs the embers of it into a new flame.
For this book is no ordinary book. It is the book that laid everything bare to Aziraphale fifty years earlier, and which Crowley has somehow unearthed in a final attempt to persuade his lover to come home...