This is a love story that could only have happened because of an accident of time travel. In it we meet Tom and Penny, who belong to a world so perfect there's no war, no poverty, no under-ripe avocados.

But when something awful happens to Penny and Tom tries to make it right - you guessed it, with time travel - he accidentally destroys everything and wakes up in our broken, mixed-up world.

Only here, Penny and Tom have a second chance.

Should he try to fix everything and go back to his brilliant, but loveless world, or remain in our broken one and take a chance on being happy with Penny?