One

It was so amazing how fast time went by, that was something that was always going to surprise Tim. It was impressive that 11 years had already passed since he lost his little girl and thus losing Isabel at the same time. Nobody knew, it wasn't their problem anyway, well... not until the case was reopened.

Or Isabel and Tim had a daughter sixteen years ago who was kidnapped and never found, then presumed dead until a lead is found and the case reopened