An outsider’s arrival forces Alexandria to rehash devastating old wounds; eye-opening secrets from the past are revealed.

Eclipse’s ex-lover returns; Reed and Sage find alarming information about Lauren’s new friend; Thunderbird helps Blink open up about her past; Jace approves a special surveillance program.

Thunderbird coordinates a mission to discover what Sentinel Services had done to an old friend of his and Lauren encounters a new friend with useful powers.