Two tales in one. Part 1 and Part 2. Uncut original material, A Jack in Time tells the story of Jack the Ripper from a whole new perspective. That he was born in 2073, a boy genius who scared holy hell out of his own mother, grew up a physicist and a scientist, and by age 35 helped discover/invent a way to move nonlinearly through time via a device (the Geophonetic Thermat) he also co-invented to help navigate the journey. He was also man of certain "urges", and he came up with the idea for the perfect crime - commit it somewhen else. When the cops start to close in, he can simply go back from whence he came from. The first book tells his story in all its grizzly detail, going deep on the how and even some of the why.
Jack the Ripper was never caught, as we all know, and now we know why. The cops couldn't find him if he wasn't there, if he hadn't even been born yet. The cops in 1888 would not be able to swallow any of it, but it never came up anyway, because nobody could even imagine such a thing. But he returns to 2108 with womanblood and Whitechapel mud still clinging to his clothing and boots. Though it takes him a few days, a workfellow figures it all out, and that's when the real trouble begins. This workfellow knows too much, and that cannot stand. Jack is both a genius and insane, and what he does to avoid becoming the first living criminal to be apprehended 220 years after his crime will knock your brain around the inside of your skull. And what happens after that... rather, what happens before that... no, what happened before... never mind, you'll just have to read it. Out of His Time picks up the story from there.
The workfellow has disappeared. He left word that he was offered a job in England and that 1) the pay was too good to even consider saying no, and 2) his getting it was contingent upon him getting there as soon as the next flight could whisk him across the water. So, he never had the time or opportunity to spill what he learned about... about Jack, he was just gone and was never heard from again. Actually, he was heard from, they just didn't realize it was him... until they did. This is the mind-rupturing story of the missing workfellow, after his disappearance.
