Expectations are very important- I came into this book expecting very little indeed, and actually it's not all that awful. It's a bit of fun! Picked it up for free with prime reading, and it's a fine little romp that doesn't overstay its welcome.
We have an organisation of "Quantum Curators" (don't worry about the name, just go with it), who visit an alternate reality in order to retrieve famous historical items before they are lost to the ravages of time. Lost masterwork paintings, famous swords, first edition folios, that sort of thing. It's a decent set-up, and it has a fun little Warehouse-13 fan-fiction vibe going on.
Ultimately the writing is pretty poor and the characters are pretty hilariously stereotyped. The thriller-style plot with its required action sequences and mandatory twists never manages to drag itself above mediocrity.
Regardless it's still an amusing little diversion, and while I wouldn't necessarily recommend it to anyone offhand, I definitely wouldn't steer people away either. Sometimes you just need an entertaining and relatively mindless action flick, and that's what this feels like. Popcorn stuff.