Museum of Thieves:
Goldie Roth lives in the city of Jewel, where impatience is a sin and boldness is a crime. But Goldie is both bold and impatient. She runs away to the mysterious Museum of Dunt, where she meets a boy named Toadspit and discovers dangerous secrets. A monstrous brizzlehound stalks the museum's corridors, and only a thief can find the way through its strange, shifting rooms.
Goldie and Toadspit have a talent for thieving.
Which is just as well, because the treacherous Fugleman has his own plans for the museum -plans that threaten the lives of everyone Goldie loves, And it will take a very bold thief to stop him.
 
City of Lies:
Goldie Roth desperately wants to be a keeper at the mysterious Museum of Dunt, but she cannot leave her parents. Then Toadspit's sister Bonnie is kidnapped. and Goldie and Toadspit are forced to follow the child-stealers to the strange and dangerous city of Spoke.
When Toadspit, too, is captured, Goldie finds herself alone in a city where every word she says means something else, and no one can be trusted.
She will need all her skills as a thief and a liar if she is to survive and save her friends. But survive she must, because the dastardly Fugleman has returned to Jewel, and the Fifth Keeper will soon be needed more than ever...
Path of Beasts: 
When Goldie, Toadspit and Bonnie steal into Jewel in the middle of the night, they find their city under the heel of the Fugleman, and the streets controlled by the Blessed Guardians and an army of ruthless mercenaries. The museum itself is seething with danger. Goldie, Toadspit and Bonnie must use all their clever tricks and hard-won bravery to undermine the Fugleman's brutal regime before he rounds up the children of Jewel.
But in order to save the children and defeat the Fugleman once and for all, Goldie must walk the Beast Road, an ancient pathway deep inside the museum, a pathway so secret and perilous that no one has ever returned from it. According. to the old stories, she can take only two companions, and they must be mortal enemies...