On Tuesday, Prince Harry's memoirs officially went up for sale and excited readers took to bookstores to get their copy with revelations about the British royal family.
Fans queuing to buy a hard copy described wanting to hear the story "from the horse's mouth."
It follows the chaotic launch of "Spare" with several leaks and copies made available in Spain last week.
Waterstons mentioned that Prince Harry's book was one of the "biggest pre-order titles for a decade."
Anticipating high customer demand, the booksellers opened their flagship branch in Piccadilly early on Tuesday, as the book has been published worldwide in 16 languages.
Branches of WH Smith in locations including Euston, Victoria, Heathrow, and Gatwick were among those extending their hours for the release.
The memoir is already atop UK bestseller for online retailer Amazon, days after headline-grabbing revelations emerged from leaks - from how Prince Harry lost his virginity to claims Prince Harry was attacked by his brother, Prince William.
The 410-page memoir, which reveals conflict and personal tensions within the royal palaces, shows Prince Harry's version of his upbringing and then falling out with the royal family.
So far Buckingham Palace and Kensington Palace have not responded.
However, allegations in the book include that Prince Harry begged his father not to remarry, that he killed 25 Taliban fighters while serving in Afghanistan, that he took drugs, partly in response to panic attacks, and that Meghan and Catherine had a difficult relationship.
Harry's book "Spare" attracted worldwide attention with its revelations about his personal struggles and accusations against other royals, including his father King Charles, stepmother Camilla, and older brother Prince William.
Although there are no waiting lists, Waterstone mentioned that there had been strong pre-orders for the memoir, which currently ranks as a bestseller on Amazon in the UK, US, Australia, Germany, and Canada.