The keeper's six

Summary: "Kate Elliott's action-packed The Keeper's Six features a world-hopping, bad-ass, spell-slinging mother who sets out to rescue her kidnapped son from a dragon lord with everything to lose. There are terrors that dwell in the space between worlds. It's been a year since Esther set foot in the Beyond, the alien landscape stretching between worlds, crossing boundaries of space and time. She and her magical travelling party--her Hex--haven't spoken since the Concilium banned them from the Beyond for a decade. But when she wakes in the middle of the night to her son's cry for help, the members of her Hex are the only ones she can trust to help her bring him back from wherever he has been taken. Esther will have to risk everything to find him. Undercover and hidden from the Concilium, she and her Hex will be tested by false dragon lords, a darkness so dense it can suffocate, and the bones of an old crime come back to haunt her"--