One hundred years earlier, a beautiful guest had disappeared from the wealthy Vauregard household, along with the second volume in a set of the collected works of Byron. Improbably enough, both guest and book seem to have reappeared, with neither having aged a day. The elderly Mr. Vauregard is inclined to believe the young woman's story of having vacationed on an astral plane. But his dubious niece calls in Henry Gamadge, gentleman-sleuth, expert in rare books, and sufficiently well-bred to avoid distressing the Vauregard sensibilities. As Gamadge soon discovers, the household includes an aging actress with ties to a spiritualist sect and a shy beauty with a shady (if crippled) fiance. As always in this delightful series, Gamadge comes up trumps, but only after careful study of the other players' cards.