The Fletchers is a Lambeth Templar hunt against Josephine and Francis Fletcher, a seemingly kindly couple who take children off the streets and ship them out of the city to be trained as Blighter soldiers. Double assassinate them for full sync.
Josephine drills a group of children on who they serve: the Grand Master. Francis joins her to say their plan is going well and that the Grand Master will soon have an army. Wait for the two to come together if you want the double assassination.
The Fletchers recruit for the Blighters in Cletus Strain's borough. The other Lambeth Templar hunts are Martin Church and the Lambeth Bullies, the borough's bounties are Leopold Bacchus, Mildred Graves and Jesse Butler, and its Blighter strongholds are Battersea Bellows and Echostreet Alley.
A double assassination kills two unaware targets at once and needs the Double Assassination skill, which opens up after Sequence 1. Francis walks the area while Josephine minds the children, so stay hidden until he comes over to talk to her, then strike both together.
Josephine has the children recite a Templar-flavoured line about the Father of Understanding and answer that they serve the Grand Master, which shows the training starts before they ever leave London.
Martin Church
Martin Church is a Lambeth Templar hunt: a condemned Templar who escaped prison weeks before his hanging and is hiding at Lambeth Palace under Blighter guard. Kill him with the hidden blade for full sync.
The Lambeth Bullies
The Lambeth Bullies is a Templar hunt in Lambeth against Ada and Clyde Cobleigh, a brother-and-sister pair hired to keep order who instead go on killing sprees. Take them both out before they kill more than two civilians.
Argus and Rose Bartlett
Argus and Rose Bartlett is a Templar hunt in The Strand against the owners of the Bed and Bottle, a pub and lodging house linked to several missing-person cases. Perform a cover kill on one of them for full sync.
Beatrice Gribble
Beatrice Gribble is a Westminster Templar hunt against a would-be lady-in-waiting who, after repeated rejections, has told the Templars she plans to kill the Queen's consort. Kill her with a voltaic bomb for full sync.