Endeavour (2013)

S06E04 Deguello

After a librarian is brutally killed at the Bodleian, Endeavour and Thursday find themselves with minimal clues, save for a pair of muddy boot prints. As they investigate, both primary suspects present compelling reasons for wanting the librarian dead. Endeavour delves into their histories, uncovering a link that seems to tie back to a seemingly benign college endowment.