Runewright detective Alex Lockerby is back in Hidden Voices, the ninth book in the Arcane Casebook series. With war brewing in Europe, German troops have marched, unopposed, into Austria and many Austrians are fleeing their homeland. One of them is a brilliant alchemist with a top secret recipe that the Nazi’s want, so someone is going to have to go to Austria and get him. Naturally, American spymaster William Donovan has someone in mind, Alex Lockerby. Oblivious of Donovan’s designs, Alex finds himself embroiled in the murder of a broadway musician and pursued by mysterious magical forces. Now Alex must solve his case, and try to keep himself out of the machinations of nations all before a seemingly unstoppable force can find him and end him.