'21 Nights' was inspired by Prince and the NPG's groundbreaking reign of 21 consecutive performances at London's O2 Arena during the summer of 2007. It's a book that transcends the conventions of form as it includes stunning photography by Randee St. Nicholas, poetry and lyrics by Prince throughout, and 'Indigo Nights', a live sessions CD from O2 after-parties at the O2's IndigoClub which also includes new music by Prince.