Click your finger only once, Christie A.

We present to your attention the book “Click your finger only once” Agatha Christie

The venerable couple of Berestords - the once indefatigable adventure of Tommy and Tappens - visits a relative in the nursing home. There, Tappens accidentally meets one strange old woman who told everyone about sinister murders, poisoning and black magic. And soon Berestords find out that this old woman suddenly - and completely without a trace - disappeared from a charitable institution. And the restless tappens sets off in search of her, despite his already solid age, for the instinct tells her that the matter here is indecent...