Lester Grimm, is haunted by jealous thoughts of his girlfriend Ramona and her past lovers. Encountering one of Ramona’s exes, the dashing author Dashiell, Frank Lester gets an idea: Join Dash’s group therapy sessions under an assumed name and secretly discover Ramona’s private past. But Lester’s plan only raises more questions: will he ever let go of the past? Does Ramona really love him? And why is his best friend suddenly speaking with a British accent?