The 1st Phibes was enjoyable enough as Vincent Price punished those Drs. whom killed his wife, each being done away with in a manner appropriate to their profession. Price seems to enjoy this type of movie, Theatre of Blood being a terrific example. The ending leaves open the possibility of a sequel, and here it is. Unfortunately.
Phibes has risen from his double coffin where he slept with his dead wife until a certain time. Upon awaking, he discovers his house destroed and a papyrus, detailing the river of life in Egypt, missing. He traces it to Robery Quarry's house and begins a series of murders to recover the papyrus. It turns out that Quarry also knows about the River of Life and is, in fact, several thousand years old and must return to the River to renew his supply of aqua vitae.
After a few more murders, Phibes and his wife journey down the river, leaving Quarry to perish beside his wife, who recoils in horror as he ages, dies, disintergrates and floats away as dust. there is probably some message there but I don't care.
Several characters reappear in the sequel, even the ones killed in the 1st movie but it's ok. The bumbling detectives add some slapstick humor and everything seems to be tongue-in-cheek.
The murders are why you watch Phibes to see what diabolical manner he thinks up to kill. The needle in the phone is okay but uninspired.
The bottle murder is good but I still don't know how he got the body in the bottle. The Scorpion is predictiable, since they're in the desert and the hawk is just stupid.
Price is his usual excellent self but doesn't seem to enjoy himself as much as he did in the 1st one.
You have to get it to see the end of Phibes and fortunately, it is the end.