Well now that was something different. A starter of SciFi, with a main course of historical fiction, followed by a dessert of botany. A bit of all three but none dominating. 
 There is certainly a great story line there. A company going back in time to collect items to save and invest in things to make them massively wealthy, messing around with immortality, save the whales or in this case a Roman Holly bush, but you need to build the story around the idea and not just have it as a couple of lines 'in' the story. I felt like I was constantly wanting more information as to what the company, who they were, what what what..... 
 My other issue with this book was that it was a bit of everything but mastered none. It shouldn't have a scifi tag to be honest, adding a rocket ship to a story doesn't make it scifi. Whilst this has more than a rocket ship it doesn't add science fiction believably. Historical Fiction aspect, could have been great, I would have loved to have learnt more about Bloody Mary and there was a great opportunity to delve into that fascinating short period where the roman church came back, but instead we get one burning at the stake and many pages on a Christmas feast. 
 My last beef is with the character interaction by the cyborgs. In the beginning they are so anti human, we are monkeys to them and we disgust them. Yet they are absolutely no different to us in their mannerisms, the way they bitch and moan with each other. At first I thought this was training, taught how to behave when in the company of mortals. But when they are alone together....i would expect immortals to interact slightly different. Getting all squealy because someone delivers a Chocolate mint slice didn't cut with me. 
 Overall, i found the writing style ok, it was easy to read but also easy to put down. The story has potential, but I doubt i'll try book two. I like the idea of the story, but it needs to be done in a better way. 
 2 stars.