In hopes of becoming a certified private investigator, Dex seeks mentorship from veteran PI Artie Banks. Meanwhile, Hoffman grows suspicious of Grey after evidence proves that he has a connection to a victim in his case.

Dex faces off against Artie Banks to take down wealthy real estate mogul Randall Tapper. Meanwhile, Detective Cosgrove leads an investigation to find Wallace Kane, a prisoner on the loose.

Despite being ordered by Lieutenant Cosgrove to take time off, Hoffman enlists Dex’s help to investigate a case. Meanwhile, Tookie’s culinary skills come in handy at Bad Alibi, and Dex stresses over an interview to become a certified PI.

When Dex’s ex Fiona, a famous musician, comes into town for a performance, Dex must protect her from a stalker. Meanwhile, Grey continues to receive the cold shoulder from Dex, and Tookie and Lieutenant Cosgrove develop a new friendship.

Dex goes undercover after she is hired by a local politician to dig up dirt on his political opponent. Meanwhile, Grey and Liz’s romance continues, and Dex celebrates a tense Friendsgiving at Bad Alibi.

Dex is confronted with unresolved feelings from her past when she is hired by Sue Lynn to investigate a case with the widow of Dex’s former flame. Meanwhile, Dex and Grey’s friendship is put to the test by his new romance with Liz.

Dex goes undercover as a high school substitute teacher after an old classmate of hers enlists her help to find out who planted drugs on her daughter. Meanwhile, Dex and Liz’s relationship gets too close for comfort.

Dex is hired by a famous TV judge to help find his prodigal brother but soon finds that she is not the only one looking for him. Elsewhere, after a carjacking under his watch, Hoffman enlists Grey’s help in tracking down the carjackers. Back at home, Dex isn’t prepared for Ansel’s unexpected news.

With Sue Lynn’s help, Dex works to find a fellow veteran’s birth parents after he discovers that he’s adopted. Meanwhile, Ansel creates a birthday bucket list for turning twenty-one and enlists Grey’s help to complete each item. Elsewhere, Grey continues to work with Hoffman and goes undercover to infiltrate a car ring operation.

Dex becomes fast friends with a new client, the owner of a male strip club who has been mysteriously losing money, but Dex soon learns not everything is as it seems. Elsewhere, Grey continues to help Hoffman and his new partner on the car-jacking case while going deeper undercover.

Dex goes under cover as a potential buyer to help Hoffman and Grey with the next phase of their drug case; Dex becomes close to a fellow veteran support group member; Ansel struggles to maintain order at Bad Alibi and enlists Tookie's help.

Dex is hired to investigate a bride’s fiancé after suspicions arise regarding the motives behind the hurried nuptials. Dex asks Hoffman for help with the case and discovers there’s more to this couple than meets the eye. Meanwhile, Hoffman goes head-to-head with his father when he learns that he will be representing a suspect in Hoffman’s case. Back at The Bad Alibi, Tookie and Ansel propose a new business idea to a reluctant Grey.

Dex and Grey venture to Los Angeles to help a client who believes her Hollywood script has been plagiarized by a former classmate. Reluctantly, Grey leaves Ansel and Tookie in charge of The Bad Alibi, and against his wishes, Tookie hosts a birthday party at the bar. Panic sets in when they discover a valuable is missing.

Dex takes on a new case helping a mother who has lost custody of her children, which triggers parallels to her time in Afghanistan. After memories of Afghanistan reemerge, Dex spirals and must face the reasons behind Benny’s death. Back at The Bad Alibi, Grey and Tookie coach Ansel on how to ask a girl out on a date.

Dex’s former client Jeremy introduces her to Major Elders who has intel on Benny’s death. Dex, suspicious of the information and looking for answers, investigates a potential cover up involving Benny’s unit in Afghanistan. Elsewhere, Hoffman and his partner, Lee, work closely on a sting operation which shockingly involves a familiar face. Meanwhile, Grey’s newfound relationship with his father is tested.

To get justice, Dex takes matters into her own hands after finding herself at the forefront of a murder investigation where she’s the prime suspect. Meanwhile, Hoffman struggles to remain impartial in the investigation and could lose everything if he continues to help Dex. Elsewhere, Grey attempts to work on his budding relationship with his estranged father while a familiar face from the past makes a surprise visit. Season finale.