I LOVE Dorothy Gilman. Can't say it enough. :)
This one, told in a series of vignets, follows Madame Karitska as she helps Lieutenant Pruden solve cases big and small. Using her psychic talents, of course. He may be skeptical, but there's no quibbling with the results. From organized crime to "witches", voodoo to stolen crosses, Madame Karitska has a bead on whatever's going on.
There's also a sequel, which I need to get from the library.
Really a perfect light summer read. I highly recommend it.