Secret Faerie Suicide Squad
Although not completely, as of the group chosen by ex-Guard Captain Mauritane for this mission, one is half Avalonian, and the other is a fully human scientist.
All of whom are languishing in an out of the way prison for political reasons. Two of them killers, even if somewhat justified - but still alive because of who they are. The human unlucky enough to be caught trying to rescue a girl who had been Changeling switched.
In your Suicide Squad scenario of course it is 'go on this really dangerous mission we can't acknowledge and if by some miracle you survive, well, we might be nice to you.'
The mission comes from the Seelie Queen Titania, and while that matters not to most of them, they'd rather be out and adventuring than locked up.
They just have to survive a magical no-man's land, traverse a very unlikely distance, survive the Seelie political intrigue and enemies that would happily bury their leader. Plus monsters and war with the Unseelie.
Or, nothing they are really likely to survive if you were running a book on it.
Oh, and you could get blown up by a Flying City.
Pretty reasonably written for a first novel.
3.5 out of 5