Tip of the hat to Speakeasy and DaveAgain for the good work they're doing.
HP is available in some less commonly taught languages but I've seen grown people forcing themselves to read it in Spanish and French because they didn't know what to choose, because they assumed it would be easy and because it's apparently a forum thing.
EA Poe is a very popular choice for bilingual and adapted reader editions.
The Works Of The Edgar Allan Poe: Bilingual Edition (English - Italian) by Edgar Allan ...
Instead of memorizing vocabulary words, work your way through an actual well- written novel .. Each individual English paragraph is paired with the corresponding Italian paragraph. It won't be an easy project, but you'll learn a lot...
Extraordinary Stories bilingual English-Arabic...
Edgar Allan Poe Двуезични разкази на английски и български език...
Books sorted by lexile levels
"Within a range from 100L below to 50L above his or her Lexile measure, a reader is expected to comprehend the text well enough to understand it, while still experiencing some reading challenge."
Harry Potter by J. K. Rowling, (Lexile Levels 880 - 1030)
EA Poe Tales of Mystery and Terror Collection (Lexile level: 840)
Alternatives
Magic Tree House by Mary Pope Osborne, Natalie Pope Boyce (Lexile Levels 230 - 590)
Goosebumps Original Series by R. L. Stine (Lexile Levels 280 - 640)
Judy Moody by Megan McDonald (Lexile Levels 390 - 600)
Artemis Fowl Graphic Novels by Eoin Colfer, Andrew Donkin (Lexile Levels estimated 535 - 635)
Hardy Boys are the Clues Brothers by Franklin W. Dixon (Lexile Levels 330 - 580)
Hardy Boys Secret Files by Franklin W. Dixon (Lexile Levels 510 - 540)
Geronimo Stilton (Lexile Levels 500 - 720)
Enid Blyton
The Famous Five 650 - 700
Alex Rider 670 - 770
Stormbreaker 670
Percy Jackson & the Olympians by Rick Riordan (Lexile Levels 590 - 740)
Nancy Drew Girl Detective by Carolyn Keene (Lexile Levels 560 - 820)
Roald Dahl Classics by Roald Dahl (Lexile Levels 450 - 870)
Roald Dahl Short Stories by Roald Dahl (Lexile Levels 410 - 980)
Spiderwick Chronicles by Holly Black, Tony DiTerlizzi (Lexile Levels 560 - 690)
Agatha Christie
And Then There Were None 570
The Murder on the Links: A Hercule Poirot ...730
A Murder Is Announced 740
The ABC. Murders 740
Murder on the Orient Express 640
Twilight Saga by Stephenie Meyer (Lexile Levels 670 - 720)
Raymond Chandler, The Big Sleep -- 660
Bambi by Felix Salten 690 (translated)
Where the Red Fern Grows 700
The Little Prince 710
Artemis Fowl by Eoin Colfer (Lexile Levels 600 - 930)
Bartimaeus by Jonathan Stroud (Lexile Levels 730 - 820)
Chronicles of Narnia by C. S. Lewis (Lexile Levels 790 - 970)
E.B. White Classics by E. B. White (Lexile Levels 680 - 920)
Redwall by Brian Jacques (Lexile Levels 600 - 1010)
I, Robot 820
Pinocchio 840
The Da Vinci Code 850
Stephen King
Cujo 830
The Stand 840
Alice's Adventures in Wonderland 850
To Kill A Mockingbird 870
The Ox-Bow Incident 890
Fahrenheit 451 890
Jane Eyre 890
His Dark Materials by Philip Pullman (Lexile Levels 890 - 950)
Lord of the Rings by J. R. R. Tolkien (Lexile Levels 810 - 920)
Tales from the Brothers Grimm 900
Hans Christian Andersen Tales 950
Rebecca of Sunnybrook Farm 960
Anne of Green Gables 990
The Adventures of Sherlock Holmes 1020
Around the World in 80 Days by Jules Verne 1070 (translated)
The Adventures of Tom Sawyer 950
Tom Sawyer, Detective 700
White Fang 970
Riders of the Purple Sage by Grey, Zane 1000
Hitchhiker’s Guide to the Galaxy Adams, Douglas 1000
Treasure Island 1070