An exclusive peek of Castle's brand new episode, reveals an even bigger puzzle that will have fans itching to find out what happens, apart from Castle's (Nathan Fillion) task to solve the mystery of why Beckett ( Stana Katic) suddenly disappears and is being chased by a team of mercenaries.

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The episode will fill in the gaps from the previous episode (episode 1 Season 8) which only showed Castle's perspective.

The new clip shows Beckett rescued by an unlikely hero just when it looks like she's about to be captured by the mercenaries. The mysterious woman who helps Beckett escape, claims to be Castle's stepmother. You can call me Rita," she says. "I'm Castle's stepmother."

Castle season eight airs Mondays at 10 pm ET on ABC.

Watch the intriguing clip that will leave you with more questions and have you begging for Monday to arrive soon.

Read: 'Wouldn't it be fun to put Castle and Beckett in a world which they don't belong in?'