In Book of the Stranger , Jacob Anderson , Nathalie Emmanuel , and Peter Dinklage play Grey Worm , Missandei , and Tyrion Lannister , respectively .
Arryn agrees to command Royce to lead the knights of the Vale to protect her. Despite Grey Worm ( Jacob Anderson ) and Missandei 's ( Nathalie Emmanuel ) objections , Tyrion Lannister ( Peter Dinklage ) arranges a diplomatic meeting with the masters of Astapor , Yunkai and Volantis .
Book of the Stranger