From the back of the book:
In the aquarium at the London Zoo, three sea turtles swim endlessly in "their little bedsitter of an ocean". Two lonely people, William G. and Neaera H. become obsessed with the turtles' captivity, and resolve to rescue them and release them in the sea.

William's and Neaera's diaries tell the story of how they achieve the turtles' freedom, and in the process re-define their own lives...

Left on the windowsill in the waiting room next to the ticket office.

Release #19 for the 2017 Tick Tock Challenge.
Release #26 for the 2017 Movie Books Challenge.
Release #54 for the 2017 You're Such an Animal Challenge.