Mosley was a Lieutenant during Sheriff Truart'sWatch. Unlike the Sheriff and Lt. Hagen, Mosley was a good cop, an idealist, believing in The Watch and her role in it. Under her command, crime was fought not only harder, but smarter, by arresting bookkeepers and fences. The downside to this is a heavy naivete, where Mosley doesn't understand that Truart is indulging in prostitution, or that her secret Pagan contact is plotting to kill her.
Winter is coming, and even though the Thief universe may not celebrate Christmas, you can find some fan mission where they do! Try missions tagged with The TDM Grand Christmas Contest, Holiday and Winter.