Alias: Sister Spy is a prequel novel based on J. J. Abrams' TV series Alias.

Alpha Kappa Chi sorority sister Jen Williams has recently died of "natural causes." Turns out that Jen was also a rookie agent for SD-6. AKX is spending spring break in Waikiki, and Jen was supposed to undertake an important mission for SD-6 there. But now Jen is dead, and it's up to Sydney to infiltrate the sorority and carry out Jen's Hawaiian mission... and find out what really happened to her sister spy.