Young Lady and Gentleman (2021)

S4E16 Methuselah's Gift

As masked assailants attempt to kill Amanda in her sleep and seize the crystal gifted to her by Rebecca, Amanda and MacLeod dive into the mystery. Their investigation reveals that the crystal might be linked to the Methuselah Stone, a legendary artifact believed to grant eternal life and invincibility to its possessor. The shocking twist is that the person willing to eliminate Amanda for the crystal could be none other than Methos himself.