Cabernet Franc is the parent of Cabernet Sauvignon (with Sauvignon Blanc) and also a parent of Merlot.
Cabernet Franc is often looked down on in favour of Cabernet Sauvignon, but this is an unfair asessment, based purely on availability. Cabernet Franc can be less generous than "CabSav" and so is less planted, and so people rarely get to taste it solo.
Great ageing potential in the right hands and with an aroma profile that features blackcurrants and green pepper in youth but can show wonderful tertiary complexity with age!
It really is worth seeking out solo.