The episode received positive reviews from critics, who praised the return of the keys to the main storyline and the direction the show is taking.
In Leipzig, Monroe's uncle Felix Dietrich (Rick Overton) is asked by Andrea Stroh to appraise books from the estate of Joseph Nebojsa.
Two Anubis Wesen from Black Claw kill Andrea, and Felix flees to Portland with one of the books – written by and for Grimms – to show Nick (David Giuntoli), asking $100,000 for the collection.
Nick is desperate to replace the books lost when Juliette (Bitsie Tulloch) burnt his Aunt Marie's trailer, but doesn't have the money.
Club gave the episode an "A−" rating and wrote, "Now, with 'Map Of The Seven Knights,' the keys are back on the scene, another plot added to Grimm's china cabinet of spinning plates.
As if the clash of a populist monster conspiracy and a shadowy government agency weren't enough to drive the season, now there's the location of a treasure that could be anything up to and including the Ark of the Covenant.
"[4] Kathleen Wiedel from TV Fanatic, gave a 4.5 star rating out of 5, stating: "Alas, poor Felix.
"[7] Christine Horton of Den of Geek wrote, "Yes it looks like the Grimm gang is finally off on a European adventure after they discover a series of mysterious links back to the old country.