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Rip Tide By James Neale
The Forecasters, who have a tech called Chrono Glass that can show the viewer the near future of whatever is viewed, coupled with training in Decision Sciences & related fields, so they can mentally parse alternate futures.
And
The Brotherhood of Time, who control Time Dragons which can go back in time and alter events.
There's a bit of a Fridge Logic element here:
http://tvtropes.org/pmwiki/pmwiki.php/Main.FridgeLogic
These two sources have the potential to make for extremely complicated plot lines! Once a story allows those kinds of things to be "legit", the writer has to be extremely careful. Not only are formal logic mistakes at risk, but other aspects of the plot might simply cease to matter!