Ghost Talkers by Mary Robinette Kowal
Excellent alt-history dive into WWI - what if spirit's were the wireless communications for military intelligence.
Kowal does a fantastic job with a big "what-if": what if mediums were used to get fallen soldiers to report on the circumstances of their death? She takes that and builds a team of "Spirit Corps" members, all mediums, who wait to take the final reports of soldiers, giving the Allies insight into enemy actions. And then... what if the Germans have a clue and start taking action neutralize this?
This was a clever and thoughtful look at war (and it's horror) wrapped in an engaging mystery and spirited (sorry) romance - recommended!
(There's even a guest appearance by JRR Tolkien!)
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