Positive Processes and Transition to Health

Inclusion Criteria: * Destabilizing life event involving profound loss or threat, with a minimum duration of 12 weeks since the event, but occurred within the last 5 years. * Between the ages of 18 and 65. * Elevated target: Scores of at least moderate (1 or higher) on at least 2 of the 3 target mechanisms: re- experiencing or ruminative processing of the destabilizing event (PSS-I items: 1, 2, 3, 4 or QIDS-C item 11), avoidance (PSS-I items 6, 7, 8), or reward deficits (PSS-I items 12, 13, or QIDS-C item 13). Exclusion Criteria: * Current diagnosis of schizophrenia, delusional disorder, or organic mental disorder as defined by DSM-5. * Current diagnosis of bipolar disorder, depression with psychotic features, or depression severe enough to require immediate psychiatric treatment (i.e., serious suicide risk with intent and plan). * Severe self-injurious behavior or suicide attempt within the previous three months. * Unwilling or unable to discontinue current cognitive behavioral psychotherapy. * No clear memory of the destabilizing event or event occurred before age 3. * Unstable dose of psychotropic medications in prior 3 months. * Ongoing intimate relationship with the perpetrator (in assault related event). * Current diagnosis of a substance use disorder (DSM-5).