This review was first posted on Music, Books and TeaI was pretty much sold on The Mine as soon as I read the synopsis. Time travel and 1940's history? Yes please! I was interested to see how well the time travel would be pulled off, and I am extremely pleased to say that John Heldt executed it wonderfully in this book.The first few chapters of The Mine started off a little shaky for me. I wasn't a fan of Adam, Joel's best friend, and I wasn't completely sold on Joel either. However, as the story progressed, Joel became a much stronger character, and I found myself completely invested into his story. I think my favourite thing about Joel was the fact that he was smart. When he finds himself transported back to the 1940's (thanks to the mysterious mine), he didn't pity himself over his 'misfortune'. Instead, he tried to find a way back home to 2000, and when it became apparent that that wasn't going to happen any time soon, he then tried to find a way to support himself in the 1940's by hopping a train to Seattle. It was refreshing to see someone just accept that they had travelled back in time instead of making a complete fool of themselves. I also liked that when he realised he could use his knowledge of the future to earn himself some money, he did just that. Whilst it's not honest, it was a very clever way to earn himself some money.Alongside Joel, the rest of the characters from the 1940's shone. I absolutely adored Tom, a guy who Joel saves from getting a beating, and I loved how kind-hearted he was. He didn't have to take Joel in, but he did. Nor did he really have to introduce Joel to Ginny and her friends, but he did. Tom was one of my favourite characters, purely because he was an all-around great guy, and my heart ached when I found out what would eventually happen to him. Ginny, Joel's grandmother, was introduced in a clever way, and knew better than to take Joel at face-value, which made sure Joel was kept on his toes all the time! Grace's introduction was possibly one of my most favourites ever. Admittedly, I did at first think that this was Joel's grandmother, but I was quickly proved wrong, and we were able to watch Grace and Joel fall in love. This wasn't without it's problems, of course, as Grace was engaged, and had to choose between two men. I also thought that the significance of Katie's character was great, especially towards the end of the book.I don't want to give anything away about the end, but I can safely say that it was absolutely brilliant! I thought it was a really smart way of ending the story, and tied up a few loose-ends that we had remaining. This novel was cleverly written, as most of the parts that were included all held a relevance to another part of the story, or linked two characters up together.This was my first foray into the world of self-publishing, and whilst this book isn't perfect, it is most certainly a great and enjoyable read!