Tyler; his story

Tyler travelled forward in time over 200 years to help Mortlock and Time Runners defeat the Virans. But who is he, and what is his story.

The story has some before story. This book discribe why the characters become  Time runners and why Tyler's legs became lame. If you want to read this book, you should read before story. Otherwise, you get some troubles to understand it. This story is very interesting, so I recommend you to read.  

Hunt Roderick,Tyler: his story,oxford university press