In the early 1930s Suckley and Roosevelt spoke of having a cottage built at a shared favorite spot they called "Our Hill", which eventually became Roosevelt's
Top Cottage. During
World War II, Suckley often stayed for long visits at the
White House, keeping the president company. Roosevelt is known to have had an affair with
Lucy Mercer during World War I, though there is no evidence that he had a similar relationship with Suckley, but there was an emotional connection. Roosevelt apparently instructed Suckley to burn at least some of the letters he wrote to her, which has fueled speculation about their content. Surviving letters include affectionate personal remarks, as well as reports and reflections about the progress of the war and meetings with figures such as
Winston Churchill and
Joseph Stalin at the
Yalta Conference. After Roosevelt died, his daughter
Anna Roosevelt Halsted and a friend came upon a cache of Suckley's letters, hidden in a box from his
stamp collection that he took everywhere with him. Anna, who was 39 at the time, gave no later indication she read or understood the significance of the letters before returning them to Suckley. ==After Roosevelt's death==