Seven Dreams. The Lokant Libraries, #1

A riddle in the skies. A puzzle spanning worlds. A prize, locked behind seven keys... Serena Carterett leads a team of masqueraders, shapeshifters and reformed thieves. Fighting crime's their job; solving ancient mysteries, not so much. But when the seven dreams riddle lights up the skies, that's got to change. The riddle speaks of treasure; better yet, a door, protecting an unimaginably dangerous power.
In the wrong hands, this power will threaten the future of the Seven Realms - and the distant past. As treasure-hunters spread across the worlds, Serena musters her band of misfits for the greatest mission of their career. To win could be everything; to lose, unthinkable. The challenge is on. Who will unlock the door?