D/K first, and alone in first, arrive in Warsaw.
C/M and D/O are the second plane to arrive, apparently as D/K's taxi takes them to Chopin's ghost playing on the lawn.
CLUE: DETOUR.
Perfect angle, or perfect pitch?
Phil: Tasks related to a 19th century composer, and Marie Curie.
Perfect pitch, make your way 3/4 mile to a palace, tune one key of a keyboard perfectly, for the concert pianist to play a tune.
Perfect Angle: Pick up a mannequin at a boutique, use an x-ray machine to locate a clue inside the mannequin, which is a destination that they'll read on the x-ray machine. Has to be read at the perfect angle.