Time Addicts by Sam Odlum

5.60

In debt to their volatile drug dealer, best friends, Denise and Johnny, agree to a sketchy job to pay off their last hit. After breaking into a decrepit stash house to steal a bag of mysterious drugs, escape proves more troublesome, as the pair find themselves trapped inside with a madman. With no way out and not one to miss an opportunity, Johnny smokes the new drug and promptly travels into the past, triggering alarming new events in the future. Separated through time, Denise is left alone to confront her past, their dealer’s real identity, and her very own existence.