I will say that there was some good action in the finale, but lots of missed opportunities. Among them was the old dilemma of two people you love are drowning just off the dock, there's only time to save one, so whom do you jump in and save? I thought Laura was going to have that choice with Nico (she really loves him now) and Serena (she's loved her all along) both in the water, but it didn't go that way, and, let's face it, if it had, there's no way Laura wouldn't have saved her daughter.
But the biggest missed opportunity in the short series was time travel itself. The water scene in the finale did harken back to the water which generated all of this, but, after a promising beginning, there was a decreasing amount of time travel in this series, or, exploration of the paradoxes and conundra that time travel inevitably and provocatively leads to.
So Somewhere Between will likely go down as a good start that looped on to itself to the point that you could barely tell at the end that time travel had anything to do with this. Which I guess is interesting in itself, in some meta way, since time travel when it is working on all cylinders is all about loops - just not the kind that are so self-obliterating you forget about time travel and think you're watching a pretty obvious police show.
But thanks for the ride, anyway. I'm always up for time travel, and will usually stay with it, as this complete set of reviews demonstrates. Cueing Ringo.