Cassandra's a spy-in-training. (But is she also a killer?) To pass the next training phase, Cassandra must kill a certain target, but the line between friend and foe quickly blurs.

Season 3: Hawk's crazy plan to sell Cas to the target goes well ... until he betrays her. Now, she has one slim chance to save her career and her life. She must survive as a rabbit.

Season 4: Cassandra's rabbit training gets interrupted by a new threat. Captured again, Cas has some hard decisions to make, starting with which role she wants: Hero or Hostage.

Survival could require sacrifice.

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These are still available on Kindle Vella. Audiobooks are also available for Assassin School Seasons 1 and 2 and Assassin School Seasons 3 and 4. This is a prequel series featuring Cassandra Mirren and loosely related to the Megan Luchek series.