A riddle: How can an upcoming Law & Order: SVU guest star be both a big name and also a Medium one?

Here’s how: Medium star Patricia Arquette will play a call girl on a November episode of the NBC procedural, TVLine has learned. Small-screen vet Anne Meara will play her mom.

In the episode – which also features guest star Jason Gedrick (Dexter) – an armed and dangerous man goes on a killing spree in New York City. Arquette’s character Jeannie is a prostitute with whom the murderer has a weekly appointment… and she’s nowhere to be found. The SVU team then must convince jaded fellow NYPD officers that the working girl’s life is worth saving.

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Meara appears as Jeannie’s (understandably) worried mother Irene.

Arquette played Medium‘s spiritually connected Allison Dubois for the drama’s seven-season run. Meara’s long list of TV credits include The King of Queens, Oz, Alf, Archie Bunker’s Place and a 2004 SVU episode in which she also played a mom – of a serial killer.

SVU airs Wednesdays at 9/8c.