Part 5: Quartet
The investigation of an assassination attempt is quickly brought to an unexpected end, but Morse continues to probe. He's soon embroiled in the dark dealings of espionage, big business and a long-held secret at the heart of the Oxford community.
Part 6: Icarus
After a teacher mysteriously disappears, Endeavour goes undercover to investigate the dark world of a public school. With the unexpected discovery of a body, he questions whom to trust. Meanwhile, Thursday's life is upended by his brother's return.
Masterpiece: Endeavour Season 5, Friday beginning at 9 p.m. on PBS 6.