The Last Beginning by Lauren James

Sixteen years ago, after a scandal that rocked the world, teenagers Katherine and Matthew vanished without a trace. Now Clove Sutcliffe is determined to find her long lost relatives. But where do you start looking for a couple who seem to have been reincarnated at every key moment in history? Who were Kate and Matt? Why were they born again and again? And who is the mysterious Ella, who keeps appearing at every turn in Clove's investigation?

For Clove, there is a mystery to solve in the past and a love to find in the future. 

Both a sequel and a prequel to The Next Together, as it ties up all the loose ends, telling things from Clove's perspective as well as going back to the original story - ah, time travel makes me head hurt!

Seeing Clove all grown up after hearing about her briefly in The Next Together was very sweet; she was a particularly adorable and terribly smart teenager but was prone to acting impulsively and that made mistakes, sometimes costly ones. Her whole journey was spurred on by the natural urge to find her biological parents and protect her family. But she was only 16 and messing with the fabric of time so obviously things don't go according to plan. 

Enter Ella: now she was damn cool. Quite the opposite to Clove and that made her interesting and irritating in equal measure! But she challenged Clove and that made her better. A great friend and a huge fangirl of Clove's - again, time travel is confusing! - Ella pushed her to be better, to live up to the future's expectations of her. I totally ship these two, they are the most adorable time-travelling couple!

Very much like the first book, the story included brilliant little snippets of IM conversations, newspaper clippings and the like, that pieced together both Katherine and Matthew's original story line and Clove and Ella's future together. I kind of wish I had read these two books back to back because I'm sure quite a few references went over my head, but it was still absolutely incredible, from its pure romance to bounding-heart action. Definitely one of my favourites. 
Published 6th October 2016 by Walker. Thank you to the publisher for my copy in exchange for an honest review.