From IMDB:
Storyline
Set against the backdrop of 1977 Los Angeles, The Nice Guys opens when single father and licensed PI Holland March (Gosling) is hired to investigate the apparent suicide of famous porn star Misty Mountains. As the trail leads him to track down a girl named Amelia (Qualley), he encounters less licensed and less hands-off private eye Jackson Healey (Russell Crowe) and his brass knuckles, both hired by the young hippie. However, the situation takes a turn for the worse when Amelia vanishes and it becomes apparent that March wasn't the only party interested. As both men are forced to team up, they'll have to take on a world filled with eccentric goons, strippers dressed as mermaids and even a possible government conspiracy.

Reviews 63 user | 151 critic
From Rotten Tomatoes:
MOVIE INFO
Shane Black (Iron Man 3) directs this police drama set in Los Angeles during the 1970s, and centering on a pair of detectives who stumble into a sprawling conspiracy while investigating the alleged suicide of a once-prominent female porn star. Russell Crowe and Ryan Gosling top-line this Warner Bros. release that reunites Lethal Weapon scribe Black with that film's producer, Joel Silver. ~ Jason Buchanan, Rovi
Rating: R (for violence, sexuality, nudity, language and brief drug use)
Genre: Drama
Directed By: Shane Black
Written By: Shane Black, Anthony Bagarozzi
In Theaters: May 20, 2016 Wide
Runtime: 1 hr. 56 min.
Warner Bros. Pictures - Official Site
TOMATOMETER 90%
Average Rating: 7.6/10
Reviews Counted: 151
Fresh: 136 | Rotten: 15
Critics Consensus: The Nice Guys hearkens back to the buddy comedies of a bygone era while adding something extra courtesy of a knowing script and the irresistible chemistry of its leads.
AUDIENCE SCORE
Average Rating: 4/5
User Ratings: 26,992
THE NICE GUYS OPENS IN THE US ON THE 20th OF MAY AND IN MALAYSIA ON THE 26th OF MAY. CLICK HERE TO FIND OUT WHEN IT OPENS NEAR YOU.