Queen Elizabeth's Personal Staff 'Are Devastated': 'It Was Still a Terrible Shock,' Says Source

As the world mourns Queen Elizabeth, her closest circle is especially heartbroken. On September 8, Buckingham Palace announced that the monarch

"peacefully" died at age 96 at her beloved Balmoral Castle in Scotland. Now, her loyal personal staff "are devastated," a close source tells PEOPLE in this week's cover story.

"They are incandescent with grief," the insider says. "However much you are prepared for it, after a lifetime of service, it was still a terrible shock." Many team

members worked for the Queen for years and will have the chance to pay their respects at her committal service on Monday. RELATED: Inside the Life and Death of Queen

Elizabeth II: 'She Will Be Missed by So Many' The somber day begins with a state funeral at Westminster Abbey at 11 a.m., in an hour-long service attended by over 2,000

diplomats, dignitaries and royal family members. From there, the coffin will process on State Gun Carriage of the Royal Navy to the Wellington Arch in Hyde Park, where it will be

loaded into the State Hearse and driven an hour west to Windsor Castle. Around 4 p.m., King Charles III, Queen Camilla and the rest of the family will fill the pews of St.

George's Chapel for a committal service. More than 800 people are expected to attend, though the event will have a more intimate feel than the state funeral. The guests

present at Westminster Abbey will not follow for the ceremony at Windsor — instead, the Queen's personal staff and those who worked on her estates will be at the smaller

ceremony.