Sign at Six, The by Stewart Edward White (1873 - 1946)

It started out as a nuisance--odd electrical problems in the Atlas building that cleared themselves up. But then it got worse, the problems becoming more and more peculiar and inexplicable. Scientist Percy Darrow has given himself the task of figuring out the who and the how, and maybe the why, as life turns strange and a little dangerous. - Summary by Tom Penn