Are the voices backwards for anyone else? English sentences are read (unintelligibly) in a French voice and vice versa.
http://paralleltext.io/read/?b=f727d42f-7649-49b0-b583-99bb9...
On Vivaldi (browser's locale is Spanish): Anything is read with a Spanish voice, unless I choose I want to read English, then an English voice is used.
Unintelligible German spoken by an English voice. My German-speaking friend thought it was trying to speak Chinese!
Maybe it's individual metadata for Sherlock Holmes - when I tried Spanish to English worked on a different book it worked ok.