When Sara John's, the daughter of a Russian defector
is threatened by a Soviet agent while on a school trip, the
EYES team is alerted, and warning bells ring in Whitechapel
where one employee shows a more than passing interest in their
case. Fred and Tessa go undercover, posing as a groundsman and
games mistress respectively, to protect the young schoolgirl
while Maggie discovers that Sara's estranged parents are desperately
close to revealing a major spy scandal, putting their daughter's
life at risk.