Molly Bachman, a young bestselling author buys the apartment of her dreams in the city. As she settles in, ready to start work on her next novel, strange sounds and bumps in the night begin to alarm her, along with the feeling of being watched and followed.

A young pregnant couple must drive through a dense ash cloud which has plunged a section of the UK into darkness. A terrifying encounter on their journey forces them to make a life changing decision.

Is there a connection between animal sounds and the music that humans create? Using a surprising and wide variety of evidence from the animal kingdom -- including the humpback whale, the lyre bird, the siamang gibbon and the great reed warbler -- Sir David Attenborough seeks to prove that the origions of music lie in territory, emotion and sex.