SOLVED. YYA, boy and girl meet in different time periods. They meet in current times, during a war, during the English invasion of Scotland, and they work together as scientists for the government, read in 2018 or 2019. [s]

[Lindsey]

The boy and girl in the current time period, they go to college together. They are trying to solve the murder of the scientist version of themselves. They fall in love in every time that they meet.

[Robert]

The Next Together, by Lauren James?

Katherine and Matthew are destined to be born again and again, century after century. Each time, their presence changes history for the better, and each time, they fall hopelessly in love, only to be tragically separated.

Spanning the Crimean War, the Siege of Carlisle and the near-future of 2019 and 2039 they find themselves sacrificing their lives to save the world. But why do they keep coming back? What else must they achieve before they can be left to live and love in peace?

Maybe the next together will be different...

A powerful and epic debut novel for teenagers about time-travel, fate and the timelessness of first love. The Next Together is told through a mixture of regular prose, diary entries, letters, "original" historical documents, news reports and internet articles.

[Lindsey]

Robert wrote: "The Next Together, by Lauren James?

Katherine and Matthew are destined to be born again and again, century after century. Each time, their presence changes history..."

Yes it is. Thank you so much.