The Pretty Little Liars will unleash their spying game during "The Silence Of E. Lamb."

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The discovery of Bethany Young's body opened up a whole new chapter in the 'A' mystery, and Aria (Lucy Hale) will have to head undercover at Bethany's old stomping grounds - the Radley Sanatorium.

Eddie Lamb is back, but the nurse is keeping his lips sealed despite his new habit mysteriously dropping drawings off at Ezra's (Ian Harding) apartment. Unfortunately, the Liars' plan to send Aria in as a spy will hit a snag when Lamb appears to recognize the teen in a new clip (see video below).

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Meanwhile, Spencer (Troian Bellisario) will take a few tips from the sneaky Ezra Fitz in order to conduct some surveillance back home. Luckily for Spencer, the English teacher has more than his fair share of spying equipment, a fact that will bring a back a few negative feelings on Spencer's part (see second clip below).

Will the Liars' sneaking around buy them any answers? Find out when Pretty Little Liars airs Tuesdays at 8 p.m. ET on ABC Family.

Tags: pretty little liars television ABC Family