Mediocre parallel-universe thriller: interworld soldier of fortune Eric Mathers vs. a nasty alien lot called the Kriths, who have the ability to ""skud"" from one line of probability to another and are busily taking over all the parallel Earths they can get their skudders on. Mathers, who has been electronically ""augmented"" to function at higher-than-human speed in combat situations, finds himself thrown into the Krith-encouraged territorial disputes of an alternate ""Nordniwerda"" (North America). From a commando raid on Krith HQ, he skuds out of various frying pans into various fires before finding the secret of the Kriths' identity. . . . Meredith can write with modest verve, but more often opts for cardboard-and-catsup excitement.