What is Unravel ?
Unravel is verb 1. to disentangle something knotted We spent hours trying to unravel the ball of string. 2. (of knitting or woven material.) to become undone Don’t cut that bit of wool or the jumper will un- ravel. 3. to come to pieces His elaborate plan began to unravel. 4. to solve a mystery No one has ever been able to unravel the mystery of her disappearance. (NOTE: un- ravelling – unravelled. The US spelling is unraveling – unraveled.)
source: Easier English, Student Dictionary Upper Intermediate Level