Cathryn de Prume

Derek and the attendings go out to celebrate when he gets the grant he needs for his clinical trial; Meredith and Alex must fend for themselves during the night shift.

A boy suffering from PTSD undergoes hypnosis and realizes he may have witnessed a murder related to a 10-year-old cold case; Danny's sister visits Oahu.

Pratt finds a suspicious gash across the chest of a boy he is examining; Kovac treats a man who was shot when he confronted his boss with a gun; Jake tries to convince Abby that his student status shouldn't keep them from dating.

When a single mother disappears after imploring her baby sitter to watch her son, the team tries to piece together her life to determine if she has been victimized or just ran away from her problems.