Blaming Melisandre for the loss (due to Tyrion's use of wildfire and Melisandre's religious associations with fire), Davos plots to murder the priestess. ... Imprisoned with Davos is Stannis' Hand and uncle-in-law Lord Alester Florent, who was imprisoned for trying to negotiate with the Lannisters behind Stannis' back.

Why did Stannis put Davos in jail?

The supplies helped Stannis's forces survive until the end of the war. For this service, Stannis rewarded Davos by bestowing him with knighthood and lands. However, Stannis also cut off the four fingertips at the knuckles from Davos's right hand (as Davos is left-handed) as punishment for his past smuggling crimes.

Is Davos dead in the books?

It is later reported that Davos has been beheaded, and Lord Manderly swears his head and hands have been mounted above the walls of White Harbor, which the Freys have confirmed. Ser Jaime Lannister releases Wylis from Harrenhal and has him take ship from Maidenpool for White Harbor.