You cannot trust in this. Murdoch was also imprisoned in England until his father appealed for his release. Now Albany has passed away, Murdoch has taken the reins of power. This may go to his head. You might remain locked in the Tower of London until you die.
You do not trust the Albany family as far as you could catapult them. However, Murdoch has inherited the authority of governor. Get in touch with him and promise that he will receive your favour if you are released.
Strike an alliance with King Henry V of England. If he releases you, you will return to Scotland and operate as a vassal king under his rule. You will then surrender all influential nobility to him – this includes the Albany family.
Which card will you play?