(CNN) -- Laura Bush is suggesting she, her husband and several aides were poisoned during a 2007 visit to Germany for the G8 summit, one of several new details in the former first lady's forthcoming memoir, "Spoken From the Heart."
Due to hit bookshelves May 4 but purchased by CNN at a Washington-area bookstore, Mrs. Bush says she and former President George W. Bush became mysteriously sick on the Germany trip to such a degree that the president became bedridden.
According to Mrs. Bush, doctors and the Secret Service investigated the possibility a poisoning had occurred but were unable to make a definitive conclusion.
News reports filed during the event show the White House did disclose Bush missed a series of morning sessions at the summit because he had contracted an apparent virus, but White House officials did not provide further details at that time.
Townsend: Bush illness investigated, poisoning unlikely
"Nearly a dozen members of our delegation were stricken, even George, who started to feel sick during an early morning staff briefing," Mrs. Bush writes. "[O]ne of our military aides had difficulty walking and a White House staffer lost all hearing in one ear. Exceedingly alarmed, the Secret Service went on full alert, combing the resort for potential poisons."

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