Blindspot will turn up the heat for the midseason finale.

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Jane Doe's (Jaimie Alexander) mysterious tats have lead the FBI to former agents, deadly fighter pilots, and jewel thieves, but the amnesiac's ink will set up the series' tour de force in "Evil Handmade Instrument." The FBI is about to stumble across the mother load of secret spy rings.

"In the thrilling mid-season finale the team goes after a group of sleeper spies that have just been activated and race to stop a slew of assassinations," NBC teased on Tuesday.

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Is this a totally new case, or will Blindspot kick off the winter hiatus by pulling back the veil on another piece of Jane Doe's enigmatic past? The next revelation to come from the NBC series will deal with Mayfair (Marianne Jean-Baptiste) and Operation Daylight, but there is still plenty to learn about Jane. Perhaps this new group of spies will have a little insight into the series' biggest mystery.

Find out more when Blindspot airs Mondays at 10 p.m. ET on NBC. Click the video below to see a preview for the series' next episode, "Persecute Envoys."

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Blindspot, Nbc, Television