Meet Me in Another Life (HarperCollins Publishers)

Thora and Santi have met before... Under the clocktower in central Cologne, with nothing but the stars above and their futures ahead. They will meet again... They don't know it yet, but they'll meet again: in numerous lives they will become friends, colleagues, lovers, enemies - meeting over and over for the first time, every time; each coming to know every version of the other. Only they can make sure it's not for the last time. But as they're endlessly drawn together and the lines between their different lives begin to blur, they are faced with one question: why? They must discover the truth of their strange attachment before this, and all their lives, are lost forever.