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In season eight, Beckett is promoted to Captain and made Commanding Officer of the 12th Precinct.
Initially finding Castle to be quite annoying, Beckett gradually warms to him as they work together to solve murder mysteries, utilizing his imagination and insight into a killer's mind and her authority and position within the police department.
When the series begins, Castle has decided to kill off his most famous character, Derrick Storm, because the character has become boring to him.
After weathering the backlash from his fans and nagging from his publisher, who is also his ex-wife, Castle is requested to help NYPD Detective Kate Beckett with a murder case that copycats scenarios from his previous novels (written before "Derrick Storm" series).
After a couple episodes Alexis realizes that Pi is not the one for her and eventually breaks up with him.
In season five, Alexis finally chooses to attend Columbia University so as to remain close to family and friends, and lives in their halls of residence while frequently dropping into her father's loft.
She is kidnapped by an ex-KGB officer who previously crossed swords with her mysterious grandfather, but displays her father's resilience, deductive logic and skills during the encounter.
On Beckett's advice, she moves back in with her father a short time later.
In season eight, it is revealed that Alexis has been unofficially working at Richard Castle Investigations for a month; in that time, she has successfully solved a number of minor cases.